diff --git a/gio/gsocketlistener.c b/gio/gsocketlistener.c
index 62ec2fcc6..3386091e6 100644
--- a/gio/gsocketlistener.c
+++ b/gio/gsocketlistener.c
@@ -790,7 +790,7 @@ g_socket_listener_accept_socket_finish (GSocketListener  *listener,
   GSocket *socket;
   GSimpleAsyncResult *simple;
 
-  g_return_val_if_fail (G_IS_SOCKET_LISTENER (listener), FALSE);
+  g_return_val_if_fail (G_IS_SOCKET_LISTENER (listener), NULL);
 
   simple = G_SIMPLE_ASYNC_RESULT (result);