diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
index 4bf88d8cb0..ea3f1f59a6 100644
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -12311,8 +12311,7 @@ qtdemux_video_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
     case GST_MAKE_FOURCC ('U', 'M', 'P', '4'):
       caps = gst_caps_new_simple ("video/mpeg",
           "mpegversion", G_TYPE_INT, 4, NULL);
-      if (codec_name)
-        *codec_name = g_strdup ("MPEG-4");
+      _codec ("MPEG-4");
       break;
 
     case GST_MAKE_FOURCC ('c', 'v', 'i', 'd'):