diff --git a/lib/iptables.inc b/lib/iptables.inc
index 74e9878..8e1699a 100644
--- a/lib/iptables.inc
+++ b/lib/iptables.inc
@@ -360,6 +360,7 @@ function enable_forwarding {
 		([[ ${IP_VERSION} == "ipv4" ]] && [[ ${Enablev4ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
 		([[ ${IP_VERSION} == "ipv6" ]] && [[ ${Enablev6ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
 		while read -r action srcinterface srcaddress dstinterface dstaddress bidirectional srcport dstport protocol syn; do
+			unset revsrcaddress revdstaddress revdstinterface revsrcinterface revsrcport revdstport
 			[[ ${action} = \#* ]] && continue
 			[[ -z ${action} ]] && continue
 			([[ ${action} != "ACCEPT" ]] && [[ ${action} != "DROP" ]]) \
@@ -410,7 +411,6 @@ function enable_forwarding {
 			${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${srcinterface} ${srcaddress} ${srcport} ${syn} ${dstinterface} ${dstaddress} ${dstport} ${conntrack_state} -j ${action}
 			[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${revsrcinterface} ${revsrcaddress} ${revsrcport} ${syn} ${revdstinterface} ${revdstaddress} ${revdstport} ${conntrack_state} -j ${action}
 		done < "${FWCONFIGDIR}/ipv${IPVER}/forward.conf"
-		unset action srcinterface srcaddress dstinterface dstaddress bidirectional srcport dstport protocol syn
 		${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
 	fi
 }