diff --git a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
index 6a80e3ed96..1f9b587a7f 100644
--- a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
+++ b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
@@ -12626,6 +12626,7 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak)
           entry->caps = gst_codec_utils_opus_create_caps (rate, channels,
               channel_mapping_family, stream_count, coupled_count,
               channel_mapping);
+          g_free (channel_mapping);
           break;
         }
         default: