diff --git a/data/pref.xml b/data/pref.xml
index 281f19a9a..90c12fcd4 100644
--- a/data/pref.xml
+++ b/data/pref.xml
@@ -262,7 +262,6 @@
       <option id="overlay_enabled" type="bool" default="false" />
       <option id="overlay_size" type="int" default="5" />
       <option id="quality" type="doc::algorithm::ResizeMethod" default="doc::algorithm::RESIZE_METHOD_NEAREST_NEIGHBOR" />
-      <option id="opacity" type="int" default="255" />
       <option id="background" type="app::Color" default="app::Color::fromRgb(180, 180, 180, 220)" />
     </section>
     <section id="onionskin">
diff --git a/data/widgets/timeline_conf.xml b/data/widgets/timeline_conf.xml
index 0e30bab91..9dfddb53d 100644
--- a/data/widgets/timeline_conf.xml
+++ b/data/widgets/timeline_conf.xml
@@ -4,12 +4,9 @@
 <vbox id="timeline_conf">
   <separator cell_hspan="2" text="Thumbnails:" left="true" horizontal="true" />
   <grid columns="3">
+    <check id="thumb_enabled" text="Force" />
     <label text="Zoom:" />
-    <slider min="10" max="100" id="zoom" cell_align="horizontal" width="128" cell_hspan="2" />
-
-    <check id="thumb_enabled" text="Enabled" />
-    <label text="Opacity:" />
-    <slider min="0" max="255" id="thumb_opacity" cell_align="horizontal" width="128" />
+    <slider min="10" max="100" id="zoom" cell_align="horizontal" width="128" />
 
     <check id="thumb_overlay_enabled" text="Overlay"/>
     <label text="Size:" />
diff --git a/src/app/thumbnails.cpp b/src/app/thumbnails.cpp
index 82d75fec1..9939e837f 100644
--- a/src/app/thumbnails.cpp
+++ b/src/app/thumbnails.cpp
@@ -79,7 +79,7 @@ namespace app {
         sprite->palette(frame),
         cel_image_on_thumb.x,
         cel_image_on_thumb.y,
-        opacity, BlendMode::NORMAL);
+        255, BlendMode::NORMAL);
 
       she::Surface* thumb_surf = she::instance()->createRgbaSurface(
         thumb_img->width(), thumb_img->height());
diff --git a/src/app/ui/configure_timeline_popup.cpp b/src/app/ui/configure_timeline_popup.cpp
index 44d3aeddc..3c0d41583 100644
--- a/src/app/ui/configure_timeline_popup.cpp
+++ b/src/app/ui/configure_timeline_popup.cpp
@@ -63,7 +63,6 @@ ConfigureTimelinePopup::ConfigureTimelinePopup()
   m_box->infront()->Click.connect(base::Bind<void>(&ConfigureTimelinePopup::onPositionChange, this));
 
   m_box->zoom()->Change.connect(base::Bind<void>(&ConfigureTimelinePopup::onZoomChange, this));
-  m_box->thumbOpacity()->Change.connect(base::Bind<void>(&ConfigureTimelinePopup::onThumbOpacityChange, this));
   m_box->thumbBackground()->Change.connect(&ConfigureTimelinePopup::onThumbBackgroundChange, this);
   m_box->thumbEnabled()->Click.connect(base::Bind<void>(&ConfigureTimelinePopup::onThumbEnabledChange, this));
   m_box->thumbOverlayEnabled()->Click.connect(base::Bind<void>(&ConfigureTimelinePopup::onThumbOverlayEnabledChange, this));
@@ -135,7 +134,6 @@ void ConfigureTimelinePopup::updateWidgetsFromCurrentSettings()
   }
 
   m_box->zoom()->setValue(docPref.thumbnails.zoom() * 10.0);
-  m_box->thumbOpacity()->setValue(docPref.thumbnails.opacity());
   m_box->thumbBackground()->setColor(docPref.thumbnails.background());
   m_box->thumbEnabled()->setSelected(docPref.thumbnails.enabled());
   m_box->thumbOverlayEnabled()->setSelected(docPref.thumbnails.overlayEnabled());
@@ -216,11 +214,6 @@ void ConfigureTimelinePopup::onZoomChange()
   docPref().thumbnails.zoom(m_box->zoom()->getValue()/10.0);
 }
 
-void ConfigureTimelinePopup::onThumbOpacityChange()
-{
-  docPref().thumbnails.opacity(m_box->thumbOpacity()->getValue());
-}
-
 void ConfigureTimelinePopup::onThumbQualityChange()
 {
   switch (m_box->thumbQuality()->getSelectedItemIndex()) {
diff --git a/src/app/ui/configure_timeline_popup.h b/src/app/ui/configure_timeline_popup.h
index 272da991a..cb8b9abe8 100644
--- a/src/app/ui/configure_timeline_popup.h
+++ b/src/app/ui/configure_timeline_popup.h
@@ -42,7 +42,6 @@ namespace app {
     void onPositionChange();
 
     void onZoomChange();
-    void onThumbOpacityChange();
     void onThumbQualityChange();
     void onThumbBackgroundChange(const app::Color& color);
     void onThumbEnabledChange();