diff --git a/sugar-emulator b/sugar-emulator
index 2e186a2c..8d6c2285 100755
--- a/sugar-emulator
+++ b/sugar-emulator
@@ -84,8 +84,8 @@ if gtk.gdk.screen_width() / 4 * 3 == gtk.gdk.screen_height():
                   gtk.gdk.screen_height() <= 900)
 else:
     fullscreen = False
-    width = gtk.gdk.screen_width() - 50
-    height = width / 4 * 3
+    height = gtk.gdk.screen_height() - 50
+    width = height * 4 / 3
 
 emulator = Emulator(width, height, fullscreen)
 emulator.start()