diff --git a/src/app/script/engine.h b/src/app/script/engine.h
index 32066f5ad..923304715 100644
--- a/src/app/script/engine.h
+++ b/src/app/script/engine.h
@@ -34,6 +34,7 @@ namespace doc {
   class FrameTag;
   class Image;
   class Layer;
+  class Mask;
   class Palette;
   class Sprite;
   class WithUserData;
@@ -134,6 +135,7 @@ namespace app {
   doc::Image* get_image_from_arg(lua_State* L, int index);
   doc::Cel* get_image_cel_from_arg(lua_State* L, int index);
   doc::frame_t get_frame_number_from_arg(lua_State* L, int index);
+  const doc::Mask* get_mask_from_arg(lua_State* L, int index);
 
 } // namespace script
 } // namespace app
diff --git a/src/app/script/selection_class.cpp b/src/app/script/selection_class.cpp
index e697de897..f30db6080 100644
--- a/src/app/script/selection_class.cpp
+++ b/src/app/script/selection_class.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2018  Igara Studio S.A.
+// Copyright (C) 2018-2019  Igara Studio S.A.
 // Copyright (C) 2015-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -12,6 +12,7 @@
 #include "app/cmd/deselect_mask.h"
 #include "app/cmd/set_mask.h"
 #include "app/doc.h"
+#include "app/doc_api.h"
 #include "app/script/docobj.h"
 #include "app/script/engine.h"
 #include "app/script/luacpp.h"
@@ -261,6 +262,44 @@ int Selection_get_bounds(lua_State* L)
   return 1;
 }
 
+int Selection_get_origin(lua_State* L)
+{
+  const auto obj = get_obj<SelectionObj>(L, 1);
+  if (auto sprite = obj->sprite(L)) {
+    Doc* doc = static_cast<Doc*>(sprite->document());
+    if (doc->isMaskVisible()) {
+      push_obj(L, doc->mask()->bounds().origin());
+    }
+    else {
+      push_new<gfx::Point>(L, 0, 0);
+    }
+  }
+  else {
+    const auto mask = obj->mask(L);
+    push_obj(L, mask->bounds().origin());
+  }
+  return 1;
+}
+
+int Selection_set_origin(lua_State* L)
+{
+  auto obj = get_obj<SelectionObj>(L, 1);
+  const auto pt = convert_args_into_point(L, 2);
+  if (auto sprite = obj->sprite(L)) {
+    Doc* doc = static_cast<Doc*>(sprite->document());
+    if (doc->isMaskVisible()) {
+      Tx tx;
+      doc->getApi(tx).setMaskPosition(pt.x, pt.y);
+      tx.commit();
+    }
+  }
+  else {
+    const auto mask = obj->mask(L);
+    mask->setOrigin(pt.x, pt.y);
+  }
+  return 0;
+}
+
 int Selection_get_isEmpty(lua_State* L)
 {
   const auto obj = get_obj<SelectionObj>(L, 1);
@@ -284,6 +323,7 @@ const luaL_Reg Selection_methods[] = {
 
 const Property Selection_properties[] = {
   { "bounds", Selection_get_bounds, nullptr },
+  { "origin", Selection_get_origin, Selection_set_origin },
   { "isEmpty", Selection_get_isEmpty, nullptr },
   { nullptr, nullptr, nullptr }
 };
@@ -306,5 +346,10 @@ void push_sprite_selection(lua_State* L, Sprite* sprite)
   push_new<SelectionObj>(L, nullptr, sprite);
 }
 
+const doc::Mask* get_mask_from_arg(lua_State* L, int index)
+{
+  return get_obj<SelectionObj>(L, index)->mask(L);
+}
+
 } // namespace script
 } // namespace app
diff --git a/src/app/script/sprite_class.cpp b/src/app/script/sprite_class.cpp
index e7066c7a2..61a676428 100644
--- a/src/app/script/sprite_class.cpp
+++ b/src/app/script/sprite_class.cpp
@@ -17,6 +17,7 @@
 #include "app/cmd/remove_frame_tag.h"
 #include "app/cmd/remove_layer.h"
 #include "app/cmd/remove_slice.h"
+#include "app/cmd/set_mask.h"
 #include "app/cmd/set_sprite_size.h"
 #include "app/cmd/set_transparent_color.h"
 #include "app/color_spaces.h"
@@ -639,6 +640,17 @@ int Sprite_set_height(lua_State* L)
   return 0;
 }
 
+int Sprite_set_selection(lua_State* L)
+{
+  auto sprite = get_docobj<Sprite>(L, 1);
+  const auto mask = get_mask_from_arg(L, 2);
+  Doc* doc = static_cast<Doc*>(sprite->document());
+  Tx tx;
+  tx(new cmd::SetMask(doc, mask));
+  tx.commit();
+  return 0;
+}
+
 int Sprite_get_bounds(lua_State* L)
 {
   const auto sprite = get_docobj<Sprite>(L, 1);
@@ -684,7 +696,7 @@ const Property Sprite_properties[] = {
   { "colorMode", Sprite_get_colorMode, nullptr },
   { "colorSpace", Sprite_get_colorSpace, Sprite_assignColorSpace },
   { "spec", Sprite_get_spec, nullptr },
-  { "selection", Sprite_get_selection, nullptr },
+  { "selection", Sprite_get_selection, Sprite_set_selection },
   { "frames", Sprite_get_frames, nullptr },
   { "palettes", Sprite_get_palettes, nullptr },
   { "layers", Sprite_get_layers, nullptr },