--- a/libavcodec/libsvt_vp9.c
+++ b/libavcodec/libsvt_vp9.c
@@ -26,6 +26,7 @@
 
 #include "libavutil/common.h"
 #include "libavutil/frame.h"
+#include "libavutil/mem.h"
 #include "libavutil/opt.h"
 #include "libavcodec/get_bits.h"