diff --git a/subprojects/gst-rtsp-server/gst/rtsp-server/rtsp-media.c b/subprojects/gst-rtsp-server/gst/rtsp-server/rtsp-media.c
index 25159b0fdd..4514ce905e 100644
--- a/subprojects/gst-rtsp-server/gst/rtsp-server/rtsp-media.c
+++ b/subprojects/gst-rtsp-server/gst/rtsp-server/rtsp-media.c
@@ -1730,7 +1730,7 @@ gst_rtsp_media_get_dscp_qos (GstRTSPMedia * media)
 
   priv = media->priv;
 
-  g_mutex_unlock (&priv->lock);
+  g_mutex_lock (&priv->lock);
   res = priv->dscp_qos;
   g_mutex_unlock (&priv->lock);