--- ./src/hamster/widgets/activityentry.py	2010-11-15 18:26:38.000000000 -0500
+++ ./src/hamster/widgets/activityentry.py	2013-02-04 20:27:39.606957036 -0500
@@ -114,7 +114,7 @@ 
         for activity in self.external_activities:
             name = activity['name']
             if activity['category']:
-                name = "%s@%s" % name, activity['category']
+                name = "%s@%s" % (name, activity['category'])
             external_names.add(name.lower())
 
         return activity_name, activity_name in external_names