diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index ac61723c66..0216003e88 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -522,7 +522,7 @@ static int rm_read_multi(AVFormatContext *s, AVIOContext *pb,
 
         size2 = avio_rb32(pb);
         ret = ff_rm_read_mdpr_codecdata(s, s->pb, st2, st2->priv_data,
-                                        size2, mime);
+                                        size2, NULL);
         if (ret < 0)
             return ret;
     }