diff --git a/dlls/dxgi/factory.c b/dlls/dxgi/factory.c
index af18bdd2c32..4c3e3cf0f34 100644
--- a/dlls/dxgi/factory.c
+++ b/dlls/dxgi/factory.c
@@ -80,9 +80,7 @@ static ULONG STDMETHODCALLTYPE dxgi_factory_Release(IWineDXGIFactory *iface)
         if (factory->device_window)
             DestroyWindow(factory->device_window);
 
-        wined3d_mutex_lock();
         wined3d_decref(factory->wined3d);
-        wined3d_mutex_unlock();
         wined3d_private_store_cleanup(&factory->private_store);
         heap_free(factory);
     }