diff --git a/libavfilter/transform.h b/libavfilter/transform.h
index 701c833ecc..edd0cf21fd 100644
--- a/libavfilter/transform.h
+++ b/libavfilter/transform.h
@@ -22,6 +22,8 @@
 #ifndef AVFILTER_TRANSFORM_H
 #define AVFILTER_TRANSFORM_H
 
+#include <stdint.h>
+
 /**
  * @file
  * transform input video