diff --git a/src/initscripts/system/suricata b/src/initscripts/system/suricata
index e327225d7..111bd9df3 100644
--- a/src/initscripts/system/suricata
+++ b/src/initscripts/system/suricata
@@ -35,8 +35,8 @@ network_zones=( red green blue orange ovpn )
 enabled_ips_zones=()
 
 # Mark and Mask options.
-MARK="0x80000000"
-MASK="0x80000000"
+REPEAT_MARK="0x80000000"
+REPEAT_MASK="0x80000000"
 
 # PID file of suricata.
 PID_FILE="/var/run/suricata.pid"
@@ -137,19 +137,19 @@ function generate_fw_rules {
 		# Loop through the array and create firewall rules.
 		for enabled_ips_zone in "${enabled_ips_zones[@]}"; do
 			# Create rules queue input and output related traffic and pass it to the IPS.
-			iptables -w -I "$IPS_INPUT_CHAIN" -i "$enabled_ips_zone" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
-			iptables -w -I "$IPS_OUTPUT_CHAIN" -o "$enabled_ips_zone" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
+			iptables -w -I "$IPS_INPUT_CHAIN" -i "$enabled_ips_zone" -m mark ! --mark "${REPEAT_MARK}/${REPEAT_MASK}" -j NFQUEUE $NFQ_OPTIONS
+			iptables -w -I "$IPS_OUTPUT_CHAIN" -o "$enabled_ips_zone" -m mark ! --mark "${REPEAT_MARK}/${REPEAT_MASK}" -j NFQUEUE $NFQ_OPTIONS
 
 			# Create rules which are required to handle forwarded traffic.
 			for enabled_ips_zone_forward in "${enabled_ips_zones[@]}"; do
-				iptables -w -I "$IPS_FORWARD_CHAIN" -i "$enabled_ips_zone" -o "$enabled_ips_zone_forward" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
+				iptables -w -I "$IPS_FORWARD_CHAIN" -i "$enabled_ips_zone" -o "$enabled_ips_zone_forward" -m mark ! --mark "${REPEAT_MARK}/${REPEAT_MASK}" -j NFQUEUE $NFQ_OPTIONS
 			done
 		done
 
 		# Clear repeat bit, so that it does not confuse IPsec or QoS
-		iptables -w -A "${IPS_INPUT_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
-		iptables -w -A "${IPS_FORWARD_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
-		iptables -w -A "${IPS_OUTPUT_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
+		iptables -w -A "${IPS_INPUT_CHAIN}" -j MARK --set-xmark "0x0/${REPEAT_MASK}"
+		iptables -w -A "${IPS_FORWARD_CHAIN}" -j MARK --set-xmark "0x0/${REPEAT_MASK}"
+		iptables -w -A "${IPS_OUTPUT_CHAIN}" -j MARK --set-xmark "0x0/${REPEAT_MASK}"
 	fi
 }