diff --git a/libavformat/wtv.h b/libavformat/wtv.h
index efe90d6846..51ac626115 100644
--- a/libavformat/wtv.h
+++ b/libavformat/wtv.h
@@ -25,7 +25,7 @@
 #include "riff.h"
 #include "asf.h"
 
-#define WTV_SECTOR_BITS    12
+#define WTV_SECTOR_BITS    INT64_C(12)
 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
 #define WTV_BIGSECTOR_BITS 18
 #define WTV_PAD8(x) (((x) + 7) & ~7)