diff --git a/sugar/shell/WindowManager.py b/sugar/shell/WindowManager.py
index 2f645475..2ae1cba4 100644
--- a/sugar/shell/WindowManager.py
+++ b/sugar/shell/WindowManager.py
@@ -90,19 +90,19 @@ class WindowManager:
 		if self._width_type is WindowManager.ABSOLUTE:
 			width = self._width			
 		elif self._width_type is WindowManager.SCREEN_RELATIVE:
-			width = screen_width * self._width
+			width = int(screen_width * self._width)
 
 		if self._height_type is WindowManager.ABSOLUTE:
 			height = self._height			
 		elif self._height_type is WindowManager.SCREEN_RELATIVE:
-			height = screen_height * self._height
+			height = int(screen_height * self._height)
 			
 		if self._position is WindowManager.CENTER:
-			x = (screen_width - width) / 2
-			y = (screen_height - height) / 2
+			x = int((screen_width - width) / 2)
+			y = int((screen_height - height) / 2)
 		elif self._position is WindowManager.LEFT:
 			x = 0
-			y = (screen_height - height) / 2
+			y = int((screen_height - height) / 2)
 			
 		self._window.move(x, y)
 		self._window.resize(width, height)