diff --git a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3 b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
index e3fd16cef..ca8f24daf 100644
--- a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
+++ b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
@@ -38,6 +38,7 @@ if [ "$ACTION" == "ifup" ]; then
 	[ -n "$gateway" ] || exit 9
 fi
 
+mwan3_lock
 $LOG notice "$ACTION interface $INTERFACE (${DEVICE:-unknown})"
 
 case "$ACTION" in
@@ -64,4 +65,6 @@ case "$ACTION" in
 	;;
 esac
 
+mwan3_unlock
+
 exit 0
diff --git a/net/mwan3/files/lib/mwan3/mwan3.sh b/net/mwan3/files/lib/mwan3/mwan3.sh
index 3798d7eb0..f4c55a96e 100644
--- a/net/mwan3/files/lib/mwan3/mwan3.sh
+++ b/net/mwan3/files/lib/mwan3/mwan3.sh
@@ -8,6 +8,14 @@ IPT6="ip6tables -t mangle -w"
 LOG="logger -t mwan3 -p"
 CONNTRACK_FILE="/proc/net/nf_conntrack"
 
+mwan3_lock() {
+	lock /var/run/mwan3.lock
+}
+
+mwan3_unlock() {
+	lock -u /var/run/mwan3.lock
+}
+
 mwan3_get_iface_id()
 {
 	local _tmp _iface _iface_count