diff --git a/mitterlib/ui/helpers/gtk_messagegrid.py b/mitterlib/ui/helpers/gtk_messagegrid.py
index 148fdc8..32dd7b2 100644
--- a/mitterlib/ui/helpers/gtk_messagegrid.py
+++ b/mitterlib/ui/helpers/gtk_messagegrid.py
@@ -247,7 +247,7 @@ class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
             # not right click
             return False
 
-        path = widget.get_path_at_pos(event.x, event.y)
+        path = widget.get_path_at_pos(int(event.x), int(event.y))
         if not path:
             return False