diff --git a/gio/gcontextspecificgroup.c b/gio/gcontextspecificgroup.c
index ffd1307e4..acad72767 100644
--- a/gio/gcontextspecificgroup.c
+++ b/gio/gcontextspecificgroup.c
@@ -73,7 +73,8 @@ g_context_specific_source_new (const gchar *name,
     NULL,
     NULL,
     g_context_specific_source_dispatch,
-    g_context_specific_source_finalize
+    g_context_specific_source_finalize,
+    NULL, NULL
   };
   GContextSpecificSource *css;
   GSource *source;