diff --git a/Shorewall/Perl/Shorewall/Config.pm b/Shorewall/Perl/Shorewall/Config.pm
index 03b73f959..bd3909243 100644
--- a/Shorewall/Perl/Shorewall/Config.pm
+++ b/Shorewall/Perl/Shorewall/Config.pm
@@ -1977,8 +1977,8 @@ sub determine_capabilities( $ ) {
     if ( $capabilities{NAT_ENABLED} ) {
 	if ( qt1( "$iptables -t nat -N $sillyname" ) ) {
 	    $capabilities{PERSISTENT_SNAT} = qt1( "$iptables -t nat -A $sillyname -j SNAT --to-source 1.2.3.4 --persistent" );
-	    qt1( "$iptables -t NAT -F $sillyname" );
-	    qt1( "$iptables -t NAT -X $sillyname" );
+	    qt1( "$iptables -t nat -F $sillyname" );
+	    qt1( "$iptables -t nat -X $sillyname" );
 	}
     }