diff --git a/libavcodec/aacenc.c b/libavcodec/aacenc.c
index 7607362142..b4045ab6eb 100644
--- a/libavcodec/aacenc.c
+++ b/libavcodec/aacenc.c
@@ -462,7 +462,7 @@ static void put_bitstream_info(AVCodecContext *avctx, AACEncContext *s,
     put_bits(&s->pb, 3, TYPE_FIL);
     put_bits(&s->pb, 4, FFMIN(namelen, 15));
     if (namelen >= 15)
-        put_bits(&s->pb, 8, namelen - 16);
+        put_bits(&s->pb, 8, namelen - 14);
     put_bits(&s->pb, 4, 0); //extension type - filler
     padbits = 8 - (put_bits_count(&s->pb) & 7);
     avpriv_align_put_bits(&s->pb);