diff --git a/Shorewall2/firewall b/Shorewall2/firewall
index 5c55a444b..484cf7c4f 100755
--- a/Shorewall2/firewall
+++ b/Shorewall2/firewall
@@ -5899,7 +5899,7 @@ add_common_rules() {
 	done
 
 	for interface in $interfaces; do
-	    file=proc/sys/net/ipv4/conf/$interface/log_martians
+	    file=/proc/sys/net/ipv4/conf/$interface/log_martians
 	    if [ -f $file ]; then
 		run_and_save_command "echo 1 > $file"
 	    else