diff --git a/sugar/canvas/GridLayout.py b/sugar/canvas/GridLayout.py
index a91d4b7d..c7c08466 100644
--- a/sugar/canvas/GridLayout.py
+++ b/sugar/canvas/GridLayout.py
@@ -35,7 +35,7 @@ class GridLayout:
 		y = constraints.y * h / self._rows + padding
 
 		width = constraints.width * w / self._cols - padding * 2
-		height = constraints.height * h / self._rows + padding * 2
+		height = constraints.height * h / self._rows - padding * 2
 
 		width = max(0, width)
 		height = max(0, height)