diff --git a/panels/printers/pp-utils.c b/panels/printers/pp-utils.c
index be781b306..25fa5652d 100644
--- a/panels/printers/pp-utils.c
+++ b/panels/printers/pp-utils.c
@@ -1213,6 +1213,7 @@ get_ipp_attributes_idle_cb (gpointer user_data)
   GIAData *data = (GIAData *) user_data;
 
   data->callback (data->result, data->user_data);
+  data->result = NULL;
 
   return FALSE;
 }