diff --git a/usr/local/www/firewall_nat.php b/usr/local/www/firewall_nat.php
index 9356e6cfc7..6d43f11d4e 100755
--- a/usr/local/www/firewall_nat.php
+++ b/usr/local/www/firewall_nat.php
@@ -199,6 +199,8 @@ include("head.inc");
 				  			echo $beginport;
 							if ($wkports[$beginport])
 								echo " (" . $wkports[$beginport] . ")";
+							else
+								echo " ";
 						} else
 							echo $beginport . " - " . $endport;
 				  ?>
@@ -216,6 +218,8 @@ include("head.inc");
 				  			echo $natent['local-port'];
 							if ($wkports[$natent['local-port']])
 								echo " (" . $wkports[$natent['local-port']] . ")";
+							else
+								echo " ";
 						} else
 							echo $natent['local-port'] . " - " .
 								($natent['local-port']+$endport-$beginport);