diff --git a/libavformat/apetag.c b/libavformat/apetag.c
index cdc602e1a9..8cb3f4a23a 100644
--- a/libavformat/apetag.c
+++ b/libavformat/apetag.c
@@ -29,7 +29,7 @@
 #include "apetag.h"
 #include "internal.h"
 
-#define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
+#define APE_TAG_FLAG_CONTAINS_HEADER  (1U << 31)
 #define APE_TAG_FLAG_LACKS_FOOTER     (1 << 30)
 #define APE_TAG_FLAG_IS_HEADER        (1 << 29)
 #define APE_TAG_FLAG_IS_BINARY        (1 << 1)