diff --git a/demos/bombs/bombs.cpp b/demos/bombs/bombs.cpp
index 53de513670..471c848a7f 100644
--- a/demos/bombs/bombs.cpp
+++ b/demos/bombs/bombs.cpp
@@ -284,7 +284,7 @@ void BombsCanvas::UpdateGridSize()
         delete m_bmp;
         m_bmp = NULL;
     }
-
+    SetSize(GetGridSizeInPixels());
     Refresh();
 }