diff --git a/gio/gtask.c b/gio/gtask.c
index 0318d9736..5a1cfab4c 100644
--- a/gio/gtask.c
+++ b/gio/gtask.c
@@ -1170,8 +1170,8 @@ g_task_return (GTask           *task,
 
   /* Otherwise, complete in the next iteration */
   source = g_idle_source_new ();
-  g_task_attach_source (task, source, complete_in_idle_cb);
   g_source_set_name (source, "[gio] complete_in_idle_cb");
+  g_task_attach_source (task, source, complete_in_idle_cb);
   g_source_unref (source);
 }