diff --git a/bin/firewall-sosdg b/bin/firewall-sosdg
index 3e49b86..9ce7c16 100755
--- a/bin/firewall-sosdg
+++ b/bin/firewall-sosdg
@@ -266,10 +266,10 @@ if [ "$TCPPORTS" ] || [ "$UDPPORTS" ]; then
 			TCPPORTS=($TCPPORTS)
 			PORTS_COUNT=${#TCPPORTS[@]}
 			PORTS_COUNT_CURR=0
-			while [ $PORTS_COUNT_CURR -lt $PORTS_COUNT ]; do
-				for ((y=$PORTS_COUNT_CURR; y <=(($PORTS_COUNT_CURR+((MULTI_MAX_PORTS-1)))); y++)); do
-					if [ ${TCPPORTS[$y]} ]; then
-						PORTS="${PORTS},${TCPPORTS[$y]}"
+			while [[ $PORTS_COUNT_CURR < $PORTS_COUNT ]]; do
+				for ((i=$PORTS_COUNT_CURR; i <=(($PORTS_COUNT_CURR+(($MULTI_MAX_PORTS-1)))); i++)); do
+					if [ ${TCPPORTS[$i]} ]; then
+						PORTS="${PORTS},${TCPPORTS[$i]}"
 					fi
 				done
 				echo -en "${PURPLE}Multiport-TCP${DEFAULT_COLOR}/${GREEN}${PORTS#,}"
@@ -569,10 +569,10 @@ if [ $IPV6 ]; then
 				IPV6TCP=($IPV6TCP)
 				PORTS_COUNT=${#IPV6TCP[@]}
 				PORTS_COUNT_CURR=0
-				while [ $PORTS_COUNT_CURR -lt $PORTS_COUNT ]; do
-					for ((y=$PORTS_COUNT_CURR; y <=(($PORTS_COUNT_CURR+((MULTI_MAX_PORTS-1)))); y++)); do
-						if [ ${IPV6TCP[$y]} ]; then
-							PORTS="$PORTS,${IPV6TCP[$y]}"
+				while [[ $PORTS_COUNT_CURR < $PORTS_COUNT ]]; do
+					for ((i=$PORTS_COUNT_CURR; i <=(($PORTS_COUNT_CURR+(($MULTI_MAX_PORTS-1)))); i++)); do
+						if [ ${IPV6TCP[$i]} ]; then
+							PORTS="${PORTS},${IPV6TCP[$i]}"
 						fi
 				done
 				echo -en "${PURPLE}Multiport-TCP${DEFAULT_COLOR}/${GREEN}${PORTS#,}"