diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 0dee7f329c..9a01705d9c 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -674,7 +674,7 @@ static int w64_read_header(AVFormatContext *s)
             uint32_t count, chunk_size, i;
 
             start = avio_tell(pb);
-            end = start + size;
+            end = start + FFALIGN(size, INT64_C(8)) - 24;
             count = avio_rl32(pb);
 
             for (i = 0; i < count; i++) {