1 files changed, 1 insertions, 1 deletions
diff --git a/game.py b/game.py
index c75cfff..c1bc398 100644
--- a/game.py
+++ b/game.py
@@ -169,7 +169,7 @@ class Game():
 
     def export(self):
         ''' Write dot to cairo surface. '''
-        w = h = 4 * self._space + 3 * self._dot_size
+        w = h = int(4 * self._space + 3 * self._dot_size)
         png_surface = cairo.ImageSurface(cairo.FORMAT_RGB24, w, h)
         cr = cairo.Context(png_surface)
         cr.set_source_rgb(192, 192, 192)