diff --git a/src/app/ui/editor/moving_pixels_state.cpp b/src/app/ui/editor/moving_pixels_state.cpp
index 6d9bde103..0a02435ab 100644
--- a/src/app/ui/editor/moving_pixels_state.cpp
+++ b/src/app/ui/editor/moving_pixels_state.cpp
@@ -268,14 +268,6 @@ bool MovingPixelsState::onMouseMove(Editor* editor, MouseMessage* msg)
   return StandbyState::onMouseMove(editor, msg);
 }
 
-bool MovingPixelsState::onMouseWheel(Editor* editor, MouseMessage* msg)
-{
-  ASSERT(m_pixelsMovement != NULL);
-
-  // Use StandbyState implementation
-  return StandbyState::onMouseWheel(editor, msg);
-}
-
 bool MovingPixelsState::onSetCursor(Editor* editor)
 {
   ASSERT(m_pixelsMovement != NULL);
diff --git a/src/app/ui/editor/moving_pixels_state.h b/src/app/ui/editor/moving_pixels_state.h
index 4174e6220..a57a61ef1 100644
--- a/src/app/ui/editor/moving_pixels_state.h
+++ b/src/app/ui/editor/moving_pixels_state.h
@@ -50,7 +50,6 @@ namespace app {
     virtual bool onMouseDown(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseUp(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseMove(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
-    virtual bool onMouseWheel(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onSetCursor(Editor* editor) OVERRIDE;
     virtual bool onKeyDown(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
     virtual bool onKeyUp(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
diff --git a/src/app/ui/editor/scrolling_state.cpp b/src/app/ui/editor/scrolling_state.cpp
index f33fc6b5e..b7c16deba 100644
--- a/src/app/ui/editor/scrolling_state.cpp
+++ b/src/app/ui/editor/scrolling_state.cpp
@@ -74,11 +74,6 @@ bool ScrollingState::onMouseMove(Editor* editor, MouseMessage* msg)
   return true;
 }
 
-bool ScrollingState::onMouseWheel(Editor* editor, MouseMessage* msg)
-{
-  return false;
-}
-
 bool ScrollingState::onSetCursor(Editor* editor)
 {
   editor->hideDrawingCursor();
diff --git a/src/app/ui/editor/scrolling_state.h b/src/app/ui/editor/scrolling_state.h
index 029918a30..f92f6a041 100644
--- a/src/app/ui/editor/scrolling_state.h
+++ b/src/app/ui/editor/scrolling_state.h
@@ -34,7 +34,6 @@ namespace app {
     virtual bool onMouseDown(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseUp(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseMove(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
-    virtual bool onMouseWheel(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onSetCursor(Editor* editor) OVERRIDE;
     virtual bool onKeyDown(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
     virtual bool onKeyUp(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
diff --git a/src/app/ui/editor/standby_state.cpp b/src/app/ui/editor/standby_state.cpp
index 97e1155df..be95c32e9 100644
--- a/src/app/ui/editor/standby_state.cpp
+++ b/src/app/ui/editor/standby_state.cpp
@@ -281,13 +281,16 @@ bool StandbyState::onMouseMove(Editor* editor, MouseMessage* msg)
 
 bool StandbyState::onMouseWheel(Editor* editor, MouseMessage* msg)
 {
-  int dz = -msg->wheelDelta();
+  int dz = msg->wheelDelta().x + msg->wheelDelta().y;
   WHEEL_ACTION wheelAction = WHEEL_NONE;
   bool scrollBigSteps = false;
 
   // Without modifiers
   if (msg->keyModifiers() == kKeyNoneModifier) {
-    wheelAction = WHEEL_ZOOM;
+    if (msg->wheelDelta().x != 0)
+      wheelAction = WHEEL_HSCROLL;
+    else
+      wheelAction = WHEEL_ZOOM;
   }
   else {
 #if 1                           // TODO make it configurable
@@ -318,7 +321,6 @@ bool StandbyState::onMouseWheel(Editor* editor, MouseMessage* msg)
       break;
 
     case WHEEL_FG:
-      // if (m_state == EDITOR_STATE_STANDBY)
       {
         int newIndex = 0;
         if (ColorBar::instance()->getFgColor().getType() == app::Color::IndexType) {
@@ -330,7 +332,6 @@ bool StandbyState::onMouseWheel(Editor* editor, MouseMessage* msg)
       break;
 
     case WHEEL_BG:
-      // if (m_state == EDITOR_STATE_STANDBY)
       {
         int newIndex = 0;
         if (ColorBar::instance()->getBgColor().getType() == app::Color::IndexType) {
@@ -342,7 +343,6 @@ bool StandbyState::onMouseWheel(Editor* editor, MouseMessage* msg)
       break;
 
     case WHEEL_FRAME:
-      // if (m_state == EDITOR_STATE_STANDBY)
       {
         Command* command = CommandsModule::instance()->getCommandByName
           ((dz < 0) ? CommandId::GotoNextFrame:
diff --git a/src/app/ui/editor/zooming_state.cpp b/src/app/ui/editor/zooming_state.cpp
index 74c0d0e54..07e075ed5 100644
--- a/src/app/ui/editor/zooming_state.cpp
+++ b/src/app/ui/editor/zooming_state.cpp
@@ -73,11 +73,6 @@ bool ZoomingState::onMouseMove(Editor* editor, MouseMessage* msg)
   return true;
 }
 
-bool ZoomingState::onMouseWheel(Editor* editor, MouseMessage* msg)
-{
-  return false;
-}
-
 bool ZoomingState::onSetCursor(Editor* editor)
 {
   editor->hideDrawingCursor();
diff --git a/src/app/ui/editor/zooming_state.h b/src/app/ui/editor/zooming_state.h
index 7e49b7142..cb4d973f8 100644
--- a/src/app/ui/editor/zooming_state.h
+++ b/src/app/ui/editor/zooming_state.h
@@ -34,7 +34,6 @@ namespace app {
     virtual bool onMouseDown(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseUp(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onMouseMove(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
-    virtual bool onMouseWheel(Editor* editor, ui::MouseMessage* msg) OVERRIDE;
     virtual bool onSetCursor(Editor* editor) OVERRIDE;
     virtual bool onKeyDown(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
     virtual bool onKeyUp(Editor* editor, ui::KeyMessage* msg) OVERRIDE;
diff --git a/src/app/ui/file_list.cpp b/src/app/ui/file_list.cpp
index 2aee4357d..a25dc946a 100644
--- a/src/app/ui/file_list.cpp
+++ b/src/app/ui/file_list.cpp
@@ -274,7 +274,7 @@ bool FileList::onProcessMessage(Message* msg)
       View* view = View::getView(this);
       if (view) {
         gfx::Point scroll = view->getViewScroll();
-        scroll.y += -static_cast<MouseMessage*>(msg)->wheelDelta() * 3*(2+getTextHeight()+2);
+        scroll += static_cast<MouseMessage*>(msg)->wheelDelta() * 3*(2+getTextHeight()+2);
         view->setViewScroll(scroll);
       }
       break;
diff --git a/src/app/ui/palette_view.cpp b/src/app/ui/palette_view.cpp
index 534ab29f2..8cdb2fc12 100644
--- a/src/app/ui/palette_view.cpp
+++ b/src/app/ui/palette_view.cpp
@@ -255,7 +255,7 @@ bool PaletteView::onProcessMessage(Message* msg)
       View* view = View::getView(this);
       if (view) {
         gfx::Point scroll = view->getViewScroll();
-        scroll.y += -static_cast<MouseMessage*>(msg)->wheelDelta() * 3 * m_boxsize;
+        scroll += static_cast<MouseMessage*>(msg)->wheelDelta() * 3 * m_boxsize;
         view->setViewScroll(scroll);
       }
       break;
diff --git a/src/app/ui/tabs.cpp b/src/app/ui/tabs.cpp
index 299cb6846..9fb780dcc 100644
--- a/src/app/ui/tabs.cpp
+++ b/src/app/ui/tabs.cpp
@@ -286,14 +286,15 @@ bool Tabs::onProcessMessage(Message* msg)
       return true;
 
     case kMouseWheelMessage: {
-      int dx = -static_cast<MouseMessage*>(msg)->wheelDelta() * getBounds().w/6;
-      // setScrollX(m_scrollX+dx);
+      int dz =
+        (static_cast<MouseMessage*>(msg)->wheelDelta().x -
+         static_cast<MouseMessage*>(msg)->wheelDelta().y) * getBounds().w/6;
 
       m_begScrollX = m_scrollX;
       if (m_ani != ANI_SMOOTH_SCROLL)
-        m_endScrollX = m_scrollX + dx;
+        m_endScrollX = m_scrollX + dz;
       else
-        m_endScrollX += dx;
+        m_endScrollX += dz;
 
       // Limit endScrollX position (to improve animation ending to the correct position)
       {
diff --git a/src/app/ui/timeline.cpp b/src/app/ui/timeline.cpp
index 82c956a1a..938a62e04 100644
--- a/src/app/ui/timeline.cpp
+++ b/src/app/ui/timeline.cpp
@@ -740,10 +740,12 @@ bool Timeline::onProcessMessage(Message* msg)
 
     case kMouseWheelMessage:
       if (m_document) {
-        int dz = -static_cast<MouseMessage*>(msg)->wheelDelta();
+        int dz = static_cast<MouseMessage*>(msg)->wheelDelta().y;
         int dx = 0;
         int dy = 0;
 
+        dx += static_cast<MouseMessage*>(msg)->wheelDelta().x;
+
         if (msg->ctrlPressed())
           dx = dz * FRMSIZE;
         else
diff --git a/src/app/ui/toolbar.cpp b/src/app/ui/toolbar.cpp
index e1b1aecd1..add4dbb3e 100644
--- a/src/app/ui/toolbar.cpp
+++ b/src/app/ui/toolbar.cpp
@@ -252,7 +252,7 @@ bool ToolBar::onProcessMessage(Message* msg)
           MouseMessage* mouseMsg2 = new MouseMessage(
             kMouseDownMessage,
             mouseMsg->buttons(),
-            mouseMsg->position(), 0);
+            mouseMsg->position());
           mouseMsg2->addRecipient(strip);
           getManager()->enqueueMessage(mouseMsg2);
         }
@@ -694,7 +694,7 @@ bool ToolBar::ToolStrip::onProcessMessage(Message* msg)
           MouseMessage* mouseMsg2 = new MouseMessage(
             kMouseDownMessage,
             mouseMsg->buttons(),
-            mouseMsg->position(), 0);
+            mouseMsg->position());
           mouseMsg2->addRecipient(bar);
           getManager()->enqueueMessage(mouseMsg2);
         }
diff --git a/src/she/event.h b/src/she/event.h
index d7417cf70..07f355369 100644
--- a/src/she/event.h
+++ b/src/she/event.h
@@ -43,21 +43,21 @@ namespace she {
     int type() const { return m_type; }
     const Files& files() const { return m_files; }
     gfx::Point position() const { return m_position; }
+    gfx::Point wheelDelta() const { return m_wheelDelta; }
     MouseButton button() const { return m_button; }
-    int delta() const { return m_delta; }
 
     void setType(Type type) { m_type = type; }
     void setFiles(const Files& files) { m_files = files; }
     void setPosition(const gfx::Point& pos) { m_position = pos; }
+    void setWheelDelta(const gfx::Point& delta) { m_wheelDelta = delta; }
     void setButton(MouseButton button) { m_button = button; }
-    void setDelta(int delta) { m_delta = delta; }
 
   private:
     Type m_type;
     Files m_files;
     gfx::Point m_position;
+    gfx::Point m_wheelDelta;
     MouseButton m_button;
-    int m_delta;
   };
 
 } // namespace she
diff --git a/src/she/she_alleg4.cpp b/src/she/she_alleg4.cpp
index 357ce8bea..92b55d2c6 100644
--- a/src/she/she_alleg4.cpp
+++ b/src/she/she_alleg4.cpp
@@ -28,6 +28,10 @@
   #else
     typedef FARPROC wndproc_t;
   #endif
+
+  #ifndef WM_MOUSEHWHEEL
+    #define WM_MOUSEHWHEEL 0x020E
+  #endif
 #endif
 
 #ifdef WIN32
@@ -297,7 +301,8 @@ static LRESULT CALLBACK wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpara
       break;
     }
 
-    case WM_MOUSEWHEEL: {
+    case WM_MOUSEWHEEL:
+    case WM_MOUSEHWHEEL: {
       RECT rc;
       ::GetWindowRect(hwnd, &rc);
 
@@ -307,7 +312,66 @@ static LRESULT CALLBACK wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpara
             GET_X_LPARAM(lparam),
             GET_Y_LPARAM(lparam)) - gfx::Point(rc.left, rc.top))
         / display_scale);
-      ev.setDelta(((short)HIWORD(wparam)) / WHEEL_DELTA);
+
+      int z = ((short)HIWORD(wparam)) / WHEEL_DELTA;
+      gfx::Point delta(
+        (msg == WM_MOUSEHWHEEL ? z: 0),
+        (msg == WM_MOUSEWHEEL ? -z: 0));
+      ev.setWheelDelta(delta);
+
+      //PRINTF("WHEEL: %d %d\n", delta.x, delta.y);
+
+      queue_event(ev);
+      break;
+    }
+
+    case WM_HSCROLL:
+    case WM_VSCROLL: {
+      RECT rc;
+      ::GetWindowRect(hwnd, &rc);
+
+      POINT pos;
+      ::GetCursorPos(&pos);
+
+      Event ev;
+      ev.setType(Event::MouseWheel);
+      ev.setPosition((gfx::Point(pos.x, pos.y) - gfx::Point(rc.left, rc.top))
+        / display_scale);
+
+      int bar = (msg == WM_HSCROLL ? SB_HORZ: SB_VERT);
+      int z = GetScrollPos(hwnd, bar);
+
+      switch (LOWORD(wparam)) {
+        case SB_LEFT:
+        case SB_LINELEFT:
+          --z;
+          break;
+        case SB_PAGELEFT:
+          z -= 2;
+          break;
+        case SB_RIGHT:
+        case SB_LINERIGHT:
+          ++z;
+          break;
+        case SB_PAGERIGHT:
+          z += 2;
+          break;
+        case SB_THUMBPOSITION:
+        case SB_THUMBTRACK:
+        case SB_ENDSCROLL:
+          // Do nothing
+          break;
+      }
+
+      gfx::Point delta(
+        (msg == WM_HSCROLL ? (z-50): 0),
+        (msg == WM_VSCROLL ? (z-50): 0));
+      ev.setWheelDelta(delta);
+
+      //PRINTF("SCROLL: %d %d\n", delta.x, delta.y);
+
+      SetScrollPos(hwnd, bar, 50, FALSE);
+
       queue_event(ev);
       break;
     }
@@ -318,9 +382,17 @@ static LRESULT CALLBACK wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpara
 
 void subclass_hwnd(HWND hwnd)
 {
-  // Add the WS_EX_ACCEPTFILES
-  SetWindowLong(hwnd, GWL_EXSTYLE,
-    GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_ACCEPTFILES);
+  SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) | WS_HSCROLL | WS_VSCROLL);
+  SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_ACCEPTFILES);
+
+  SCROLLINFO si;
+  si.cbSize = sizeof(SCROLLINFO);
+  si.fMask = SIF_POS | SIF_RANGE;
+  si.nMin = 0;
+  si.nPos = 50;
+  si.nMax = 100;
+  SetScrollInfo(hwnd, SB_HORZ, &si, FALSE);
+  SetScrollInfo(hwnd, SB_VERT, &si, FALSE);
 
   base_wndproc = (wndproc_t)SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)wndproc);
 }
diff --git a/src/ui/combobox.cpp b/src/ui/combobox.cpp
index 074fbd6ed..c01565ea5 100644
--- a/src/ui/combobox.cpp
+++ b/src/ui/combobox.cpp
@@ -436,7 +436,7 @@ bool ComboBoxEntry::onProcessMessage(Message* msg)
           releaseMouse();
 
           MouseMessage mouseMsg2(kMouseDownMessage,
-            mouseMsg->buttons(), mouseMsg->position(), 0);
+            mouseMsg->buttons(), mouseMsg->position());
           pick->sendMessage(&mouseMsg2);
           return true;
         }
diff --git a/src/ui/int_entry.cpp b/src/ui/int_entry.cpp
index 5572c3f4c..dfe5f25c9 100644
--- a/src/ui/int_entry.cpp
+++ b/src/ui/int_entry.cpp
@@ -84,7 +84,7 @@ bool IntEntry::onProcessMessage(Message* msg)
 
           MouseMessage mouseMsg2(kMouseDownMessage,
             mouseMsg->buttons(),
-            mouseMsg->position(), 0);
+            mouseMsg->position());
           m_slider->sendMessage(&mouseMsg2);
         }
       }
@@ -93,7 +93,9 @@ bool IntEntry::onProcessMessage(Message* msg)
     case kMouseWheelMessage:
       if (isEnabled()) {
         int oldValue = getValue();
-        int newValue = oldValue + static_cast<MouseMessage*>(msg)->wheelDelta();
+        int newValue = oldValue
+          + static_cast<MouseMessage*>(msg)->wheelDelta().x
+          - static_cast<MouseMessage*>(msg)->wheelDelta().y;
         newValue = MID(m_min, newValue, m_max);
         if (newValue != oldValue) {
           setValue(newValue);
diff --git a/src/ui/listbox.cpp b/src/ui/listbox.cpp
index 54d7a1478..9c670aa08 100644
--- a/src/ui/listbox.cpp
+++ b/src/ui/listbox.cpp
@@ -186,7 +186,7 @@ bool ListBox::onProcessMessage(Message* msg)
       View* view = View::getView(this);
       if (view) {
         gfx::Point scroll = view->getViewScroll();
-        scroll.y += -static_cast<MouseMessage*>(msg)->wheelDelta() * getTextHeight()*3;
+        scroll += static_cast<MouseMessage*>(msg)->wheelDelta() * getTextHeight()*3;
         view->setViewScroll(scroll);
       }
       break;
diff --git a/src/ui/manager.cpp b/src/ui/manager.cpp
index 1a862998b..d33cb07ce 100644
--- a/src/ui/manager.cpp
+++ b/src/ui/manager.cpp
@@ -290,7 +290,8 @@ void Manager::generateMouseMessages()
 
   // Mouse wheel
   if (jmouse_z(0) != jmouse_z(1))
-    handleMouseWheel(mousePos, currentMouseButtons(0), jmouse_z(0) - jmouse_z(1));
+    handleMouseWheel(mousePos, currentMouseButtons(0),
+      gfx::Point(0, jmouse_z(1) - jmouse_z(0)));
 
   // Mouse clicks
   if (jmouse_b(0) != jmouse_b(1)) {
@@ -521,7 +522,7 @@ void Manager::generateMessagesFromSheEvents()
         if (!mouse_events_from_she)
           continue;
 
-        handleMouseWheel(sheEvent.position(), m_mouseButtons, sheEvent.delta());
+        handleMouseWheel(sheEvent.position(), m_mouseButtons, sheEvent.wheelDelta());
         break;
       }
     }
@@ -588,11 +589,12 @@ void Manager::handleMouseDoubleClick(const gfx::Point& mousePos, MouseButtons mo
   }
 }
 
-void Manager::handleMouseWheel(const gfx::Point& mousePos, MouseButtons mouseButtons, int delta)
+void Manager::handleMouseWheel(const gfx::Point& mousePos, MouseButtons mouseButtons, const gfx::Point& wheelDelta)
 {
-  enqueueMessage(newMouseMessage(kMouseWheelMessage,
+  enqueueMessage(newMouseMessage(
+      kMouseWheelMessage,
       (capture_widget ? capture_widget: mouse_widget),
-      mousePos, mouseButtons, delta));
+      mousePos, mouseButtons, wheelDelta));
 }
 
 // Handles Z order: Send the window to top (only when you click in a
@@ -1425,9 +1427,10 @@ Widget* Manager::findMagneticWidget(Widget* widget)
 
 // static
 Message* Manager::newMouseMessage(MessageType type,
-  Widget* widget, gfx::Point mousePos, MouseButtons buttons, int delta)
+  Widget* widget, const gfx::Point& mousePos,
+  MouseButtons buttons, const gfx::Point& wheelDelta)
 {
-  Message* msg = new MouseMessage(type, buttons, mousePos, delta);
+  Message* msg = new MouseMessage(type, buttons, mousePos, wheelDelta);
 
   if (widget != NULL)
     msg->addRecipient(widget);
diff --git a/src/ui/manager.h b/src/ui/manager.h
index c1f08a267..b130dc9ed 100644
--- a/src/ui/manager.h
+++ b/src/ui/manager.h
@@ -100,7 +100,7 @@ namespace ui {
     void handleMouseDown(const gfx::Point& mousePos, MouseButtons mouseButtons);
     void handleMouseUp(const gfx::Point& mousePos, MouseButtons mouseButtons);
     void handleMouseDoubleClick(const gfx::Point& mousePos, MouseButtons mouseButtons);
-    void handleMouseWheel(const gfx::Point& mousePos, MouseButtons mouseButtons, int delta);
+    void handleMouseWheel(const gfx::Point& mousePos, MouseButtons mouseButtons, const gfx::Point& wheelDelta);
     void handleWindowZOrder();
 
     void pumpQueue();
@@ -108,7 +108,8 @@ namespace ui {
     static bool someParentIsFocusStop(Widget* widget);
     static Widget* findMagneticWidget(Widget* widget);
     static Message* newMouseMessage(MessageType type,
-      Widget* widget, gfx::Point mousePos, MouseButtons buttons, int delta = 0);
+      Widget* widget, const gfx::Point& mousePos,
+      MouseButtons buttons, const gfx::Point& wheelDelta = gfx::Point(0, 0));
     static MouseButtons currentMouseButtons(int antique);
     void broadcastKeyMsg(Message* msg);
 
diff --git a/src/ui/message.h b/src/ui/message.h
index 36bd885ed..79e5be067 100644
--- a/src/ui/message.h
+++ b/src/ui/message.h
@@ -101,22 +101,27 @@ namespace ui {
   class MouseMessage : public Message
   {
   public:
-    MouseMessage(MessageType type, MouseButtons buttons, const gfx::Point& pos, int delta)
-      : Message(type), m_buttons(buttons), m_pos(pos), m_delta(delta) {
+    MouseMessage(MessageType type, MouseButtons buttons,
+      const gfx::Point& pos,
+      const gfx::Point& wheelDelta = gfx::Point(0, 0))
+      : Message(type),
+        m_buttons(buttons),
+        m_pos(pos),
+        m_wheelDelta(wheelDelta) {
     }
 
     MouseButtons buttons() const { return m_buttons; }
     bool left() const { return (m_buttons & kButtonLeft) == kButtonLeft; }
     bool right() const { return (m_buttons & kButtonRight) == kButtonRight; }
     bool middle() const { return (m_buttons & kButtonMiddle) == kButtonMiddle; }
-    int wheelDelta() const { return m_delta; }
+    gfx::Point wheelDelta() const { return m_wheelDelta; }
 
     const gfx::Point& position() const { return m_pos; }
 
   private:
     MouseButtons m_buttons;     // Pressed buttons
     gfx::Point m_pos;           // Mouse position
-    int m_delta;                // Wheel axis variation
+    gfx::Point m_wheelDelta;    // Wheel axis variation
   };
 
   class TimerMessage : public Message
diff --git a/src/ui/slider.cpp b/src/ui/slider.cpp
index 02f61716e..2f75c1cd5 100644
--- a/src/ui/slider.cpp
+++ b/src/ui/slider.cpp
@@ -191,7 +191,9 @@ bool Slider::onProcessMessage(Message* msg)
 
     case kMouseWheelMessage:
       if (isEnabled()) {
-        int value = m_value + static_cast<MouseMessage*>(msg)->wheelDelta();
+        int value = m_value
+          + static_cast<MouseMessage*>(msg)->wheelDelta().x
+          - static_cast<MouseMessage*>(msg)->wheelDelta().y;
 
         value = MID(m_min, value, m_max);
 
diff --git a/src/ui/textbox.cpp b/src/ui/textbox.cpp
index bf1ad10c2..82af66cb8 100644
--- a/src/ui/textbox.cpp
+++ b/src/ui/textbox.cpp
@@ -134,7 +134,7 @@ bool TextBox::onProcessMessage(Message* msg)
       if (view) {
         gfx::Point scroll = view->getViewScroll();
 
-        scroll.y += -static_cast<MouseMessage*>(msg)->wheelDelta() * getTextHeight()*3;
+        scroll += static_cast<MouseMessage*>(msg)->wheelDelta() * getTextHeight()*3;
 
         view->setViewScroll(scroll);
       }