diff --git a/net/mwan3/files/usr/sbin/mwan3rtmon b/net/mwan3/files/usr/sbin/mwan3rtmon
index b7f03cc874..d8ccffeb04 100755
--- a/net/mwan3/files/usr/sbin/mwan3rtmon
+++ b/net/mwan3/files/usr/sbin/mwan3rtmon
@@ -75,7 +75,7 @@ mwan3_rtmon_route_handle()
 
 	if [ "$route_line" = "$1" ]; then
 		action="replace"
-		$IPS -! add mwan3_connected_${route_family##ip} ${route_line%% *}
+		$IPS -! add mwan3_connected_${route_family} ${route_line%% *}
 	else
 		action="del"
 		mwan3_set_connected_${route_family}