diff --git a/src/webp/format_constants.h b/src/webp/format_constants.h
index 4c04b50c..b6e78a64 100644
--- a/src/webp/format_constants.h
+++ b/src/webp/format_constants.h
@@ -15,7 +15,7 @@
 #define WEBP_WEBP_FORMAT_CONSTANTS_H_
 
 // Create fourcc of the chunk from the chunk tag characters.
-#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
+#define MKFOURCC(a, b, c, d) ((a) | (b) << 8 | (c) << 16 | (uint32_t)(d) << 24)
 
 // VP8 related constants.
 #define VP8_SIGNATURE 0x9d012a              // Signature in VP8 data.