diff --git a/Shorewall/firewall b/Shorewall/firewall
index 51870a70c..9c3300c93 100755
--- a/Shorewall/firewall
+++ b/Shorewall/firewall
@@ -3488,6 +3488,8 @@ nolock=
 
 [ $# -ne 1 ] && usage
 
+trap "my_mutex_off; exit 2" 1 2 3 4 5 6 9
+
 command="$1"
 
 case "$command" in