diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index 5469e0ace5..44df4fff34 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -726,7 +726,7 @@ static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
         int tunsync         = 0;
         int tcomp           = 0;
         int tencr           = 0;
-        unsigned long dlen;
+        unsigned long av_unused dlen;
 
         if (isv34) {
             if (avio_read(pb, tag, 4) < 4)