diff --git a/libavformat/mux.c b/libavformat/mux.c
index eff7caab25..79625c6547 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -339,6 +339,8 @@ static int init_muxer(AVFormatContext *s, AVDictionary **options)
     /* set muxer identification string */
     if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
         av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
+    } else {
+        av_dict_set(&s->metadata, "encoder", NULL, 0);
     }
 
     if (options) {
diff --git a/tests/ref/lavf-fate/ogg_vp3 b/tests/ref/lavf-fate/ogg_vp3
index b77476d294..9e9cc7ea6b 100644
--- a/tests/ref/lavf-fate/ogg_vp3
+++ b/tests/ref/lavf-fate/ogg_vp3
@@ -1,3 +1,3 @@
-adbe6c30bdfe934dc5ae397f4db2960d *./tests/data/lavf-fate/lavf.ogg
-417644 ./tests/data/lavf-fate/lavf.ogg
+4bd51dac3194fa88ae33767c25b4b1e6 *./tests/data/lavf-fate/lavf.ogg
+417621 ./tests/data/lavf-fate/lavf.ogg
 ./tests/data/lavf-fate/lavf.ogg CRC=0x037e3e79