diff --git a/gio/gthreadedresolver.c b/gio/gthreadedresolver.c
index 6732612e1..c259b5724 100644
--- a/gio/gthreadedresolver.c
+++ b/gio/gthreadedresolver.c
@@ -319,6 +319,7 @@ resolve_sync (GThreadedResolver         *gtr,
   if (!req->cancellable || !gtr->thread_pool)
     {
       req->resolve_func (req, error);
+      g_mutex_unlock (req->mutex);
       return;
     }