diff --git a/src/webpimage.cpp b/src/webpimage.cpp
index d1fc73e7..7aae52b8 100644
--- a/src/webpimage.cpp
+++ b/src/webpimage.cpp
@@ -490,7 +490,7 @@ namespace Exiv2 {
 
         io_->read(data, WEBP_TAG_SIZE * 3);
 
-        WebPImage::decodeChunks(Exiv2::getULong(data + WEBP_TAG_SIZE, littleEndian) + 12);
+        WebPImage::decodeChunks(Exiv2::getULong(data + WEBP_TAG_SIZE, littleEndian) + 8);
 
     } // WebPImage::readMetadata