diff --git a/demux/demux.c b/demux/demux.c
index c3635b9ab1..9447abec96 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -880,7 +880,7 @@ int demuxer_add_chapter(demuxer_t *demuxer, struct bstr name,
         .metadata = talloc_zero(demuxer, struct mp_tags),
         .demuxer_id = demuxer_id,
     };
-    mp_tags_set_bstr(new.metadata, bstr0("title"), name);
+    mp_tags_set_bstr(new.metadata, bstr0("TITLE"), name);
     MP_TARRAY_APPEND(demuxer, demuxer->chapters, demuxer->num_chapters, new);
     return 0;
 }
diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
index 9fcadf6dfa..cf9818d74c 100644
--- a/demux/demux_mkv.c
+++ b/demux/demux_mkv.c
@@ -372,7 +372,7 @@ static int demux_mkv_read_info(demuxer_t *demuxer)
                mkv_d->duration);
     }
     if (info.n_title) {
-        demux_info_add_bstr(demuxer, bstr0("title"), info.title);
+        demux_info_add_bstr(demuxer, bstr0("TITLE"), info.title);
     }
     if (info.n_segment_uid) {
         int len = info.segment_uid.len;