diff --git a/corbo/views.py b/corbo/views.py
index 683a4c3..ca3cdc7 100644
--- a/corbo/views.py
+++ b/corbo/views.py
@@ -296,8 +296,9 @@ class SubscriptionDeleteView(DeleteView):
 
     def delete(self, request, *args, **kwargs):
         response = super(SubscriptionDeleteView, self).delete(request, *args, **kwargs)
-        success_message = _('%s successfuly unsubscribed from %s') % (
-            self.object.identifier.split(':', 1)[1], self.object.category.name)
+        success_message = _('%(user)s successfuly unsubscribed from %(category)s') % {
+                'user': self.object.identifier.split(':', 1)[1],
+                'category': self.object.category.name}
         messages.success(request, success_message)
         return response