diff --git a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
index 08fc9ddd3..07e43c7b0 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -454,7 +454,9 @@ fi
 			if (([ "$(uci -q get openmptcprouter.settings.master)" = "change" ] || [ "$(uci -q get openmptcprouter.settings.master)" = "" ]) && [ "$OMR_TRACKER_LATENCY" -lt "$((masterlatency/2))" ]) || ([ "$(uci -q get openmptcprouter.settings.master)" = "dynamic" ] && [ "$OMR_TRACKER_LATENCY" -lt "$((masterlatency/2))" ] && [ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency_previous)" -lt "$((masterlatency/2))" ]); then
 				uci -q set network.$masterintf.multipath='on'
 				uci -q set network.$OMR_TRACKER_INTERFACE.multipath='master'
-				uci -q add_list openmptcprouter.settings.master_lcintf="$OMR_TRACKER_INTERFACE"
+				if [ "$(uci -q get openmptcprouter.settings.master_lcintf | grep $OMR_TRACKER_INTERFACE)" = "" ]; then
+					uci -q add_list openmptcprouter.settings.master_lcintf="$OMR_TRACKER_INTERFACE"
+				fi
 				if [ "$(uci -q get openmptcprouter.settings.master)" != "dynamic" ]; then
 					uci -q commit network
 				fi