diff --git a/src/webp/decode.h b/src/webp/decode.h
index ac89cdc4..002a9651 100644
--- a/src/webp/decode.h
+++ b/src/webp/decode.h
@@ -18,7 +18,7 @@
 extern "C" {
 #endif
 
-#define WEBP_DECODER_ABI_VERSION 0x0002
+#define WEBP_DECODER_ABI_VERSION 0x0003
 
 // Return the decoder's version number, packed in hexadecimal using 8bits for
 // each of major/minor/revision. E.g: v2.5.7 is 0x020507.
diff --git a/src/webp/decode_vp8.h b/src/webp/decode_vp8.h
index eecc3865..6d391edc 100644
--- a/src/webp/decode_vp8.h
+++ b/src/webp/decode_vp8.h
@@ -12,6 +12,8 @@
 #ifndef WEBP_WEBP_DECODE_VP8_H_
 #define WEBP_WEBP_DECODE_VP8_H_
 
+#include <stddef.h>  // for size_t
+
 #include "./decode.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)
@@ -82,7 +84,7 @@ struct VP8Io {
   int fancy_upsampling;
 
   // Input buffer.
-  uint32_t data_size;
+  size_t data_size;
   const uint8_t* data;
 
   // If true, in-loop filtering will not be performed even if present in the