diff --git a/ext/webrtc/gstwebrtcbin.c b/ext/webrtc/gstwebrtcbin.c
index 41e915d798..888c5135e5 100644
--- a/ext/webrtc/gstwebrtcbin.c
+++ b/ext/webrtc/gstwebrtcbin.c
@@ -1509,6 +1509,7 @@ _pick_rtx_payload_types (GstWebRTCBin * webrtc, WebRTCTransceiver * trans,
     str = g_strdup_printf ("%u", target_ssrc);
     gst_structure_set (trans->local_rtx_ssrc_map, str, G_TYPE_UINT,
         g_random_int (), NULL);
+    g_free (str);
 
     str = g_strdup_printf ("%u", pt);
     gst_sdp_media_add_format (media, str);