diff --git a/Editor/AGS.Editor/Components/RoomsComponent.cs b/Editor/AGS.Editor/Components/RoomsComponent.cs
index 2dfd09175cf..e4035184a9c 100644
--- a/Editor/AGS.Editor/Components/RoomsComponent.cs
+++ b/Editor/AGS.Editor/Components/RoomsComponent.cs
@@ -1977,6 +1977,7 @@ private void RefreshBackground(int i)
             _backgroundCache[i]?.Dispose();
             _backgroundCache[i] = new RoomImage(LoadBackground(i), false);
             ((RoomSettingsEditor)_roomSettings.Control).InvalidateDrawingBuffer();
+            _loadedRoom.Modified = true;
         }
 
         /// <summary>