diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 6157521ab3..b004d118f0 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -221,6 +221,7 @@ void avfilter_init(void)
     avfilter_register(&vf_passthrough);
     avfilter_register(&vf_rgb2bgr);
     avfilter_register(&vf_slicify);
+    avfilter_register(&vf_vflip);
     avfilter_register(&vo_sdl);
 }