diff --git a/html/cgi-bin/routing.cgi b/html/cgi-bin/routing.cgi
index 15989bd27..f2014e2e1 100644
--- a/html/cgi-bin/routing.cgi
+++ b/html/cgi-bin/routing.cgi
@@ -154,7 +154,7 @@ if ($settings{'ACTION'} eq $Lang::tr{'add'}) {
 			last;
 		}
 		#Is the network part of an internal network?
-		$errormessage .= &General::check_net_internal($settings{'IP'});
+		$errormessage .= &General::check_net_internal_exact($settings{'IP'});
 		last;
 	}