diff --git a/libavcodec/videotoolbox_vp9.c b/libavcodec/videotoolbox_vp9.c
index 1b6d08f00b..a998f36d1a 100644
--- a/libavcodec/videotoolbox_vp9.c
+++ b/libavcodec/videotoolbox_vp9.c
@@ -24,6 +24,7 @@
 #include "videotoolbox.h"
 #include "libavutil/hwcontext_videotoolbox.h"
 #include "vt_internal.h"
+#include "libavutil/avassert.h"
 #include "libavutil/avutil.h"
 #include "libavutil/frame.h"
 #include "libavutil/hwcontext.h"