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 ef38d005b..83522223b 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -366,7 +366,7 @@ if [ "$OMR_TRACKER_PREV_STATUS" != "" ] && [ "$OMR_TRACKER_PREV_STATUS" != "$OMR
 fi
 
 multipath_config=$(uci -q get "network.$OMR_TRACKER_INTERFACE.multipath")
-[ "$multipath_config" ] && multipath_config=$(uci -q get "openmptcprouter.$OMR_TRACKER_INTERFACE.multipath" || echo "off")
+[ -z "$multipath_config" ] && multipath_config=$(uci -q get "openmptcprouter.$OMR_TRACKER_INTERFACE.multipath" || echo "off")
 if [ "$multipath_config" = "master" ]; then
 	if [ "$default_gw" != "$OMR_TRACKER_DEVICE_GATEWAY" ] || [ "$default_gw" = "" ]; then
 		omrvpn_intf=$(uci -q get "network.omrvpn.ifname" || echo "tun")