diff --git a/sugar/graphics/button.py b/sugar/graphics/button.py
index fc869f99..647f36df 100644
--- a/sugar/graphics/button.py
+++ b/sugar/graphics/button.py
@@ -25,7 +25,7 @@ class CanvasButton(hippo.CanvasButton):
         hippo.CanvasButton.__init__(self, text=label)
 
         if icon_name:
-            icon = Icon(icon_name,icon_size=gtk.ICON_SIZE_BUTTON)
+            icon = Icon(icon_name=icon_name, icon_size=gtk.ICON_SIZE_BUTTON)
             self.props.widget.set_image(icon)
             icon.show()