diff --git a/src/editor/overlay_widget.cpp b/src/editor/overlay_widget.cpp
index d41ffc01cc8..9e26db89a2b 100644
--- a/src/editor/overlay_widget.cpp
+++ b/src/editor/overlay_widget.cpp
@@ -153,14 +153,7 @@ void
 EditorOverlayWidget::input_tile(const Vector& pos, uint32_t tile)
 {
   auto tilemap = m_editor.get_selected_tilemap();
-  if (!tilemap) {
-    return;
-  }
-
-  if ( pos.x < 0 ||
-       pos.y < 0 ||
-       pos.x >= static_cast<float>(tilemap->get_width()) ||
-       pos.y >= static_cast<float>(tilemap->get_height())) {
+  if (!tilemap || !is_position_inside_tilemap(tilemap, pos)) {
     return;
   }
 
@@ -172,14 +165,7 @@ void
 EditorOverlayWidget::autotile(const Vector& pos, uint32_t tile)
 {
   auto tilemap = m_editor.get_selected_tilemap();
-  if (!tilemap) {
-    return;
-  }
-
-  if ( pos.x < 0 ||
-       pos.y < 0 ||
-       pos.x >= static_cast<float>(tilemap->get_width()) ||
-       pos.y >= static_cast<float>(tilemap->get_height())) {
+  if (!tilemap || !is_position_inside_tilemap(tilemap, pos)) {
     return;
   }
 
@@ -211,14 +197,7 @@ EditorOverlayWidget::autotile_corner(const Vector& pos, uint32_t tile,
                                      TileMap::AutotileCornerOperation op)
 {
   auto tilemap = m_editor.get_selected_tilemap();
-  if (!tilemap) {
-    return;
-  }
-
-  if ( pos.x < 0 ||
-       pos.y < 0 ||
-       pos.x >= static_cast<float>(tilemap->get_width()) ||
-       pos.y >= static_cast<float>(tilemap->get_height())) {
+  if (!tilemap || !is_position_inside_tilemap(tilemap, pos)) {
     return;
   }
 
@@ -461,10 +440,7 @@ EditorOverlayWidget::fill()
     Vector tpos = pos - m_hovered_tile;
 
     // Tests for being inside tilemap:
-    if ( pos.x < 0 ||
-         pos.y < 0 ||
-         pos.x >= static_cast<float>(tilemap->get_width()) ||
-         pos.y >= static_cast<float>(tilemap->get_height()))
+    if (!is_position_inside_tilemap(tilemap, pos))
     {
       pos_stack.pop_back();
       continue;
@@ -1522,4 +1498,12 @@ EditorOverlayWidget::align_to_tilemap(const Vector& sp, int tile_size) const
   return glm::trunc(sp_) * static_cast<float>(tile_size);
 }
 
+bool
+EditorOverlayWidget::is_position_inside_tilemap(const TileMap* tilemap, const Vector& pos) const
+{
+  return pos.x > 0 && pos.y > 0 && 
+         pos.x <= static_cast<float>(tilemap->get_width()) &&
+         pos.y <= static_cast<float>(tilemap->get_height());
+}
+
 /* EOF */
diff --git a/src/editor/overlay_widget.hpp b/src/editor/overlay_widget.hpp
index f657b8dda69..63e0b2801ca 100644
--- a/src/editor/overlay_widget.hpp
+++ b/src/editor/overlay_widget.hpp
@@ -111,6 +111,7 @@ class EditorOverlayWidget final : public Widget
   Vector sp_to_tp(const Vector& sp, int tile_size = 32) const;
   Vector tile_screen_pos(const Vector& tp, int tile_size = 32) const;
   Vector align_to_tilemap(const Vector& sp, int tile_size = 32) const;
+  bool is_position_inside_tilemap(const TileMap* tilemap, const Vector& pos) const;
 
   // in sector position
   Rectf drag_rect() const;