diff --git a/lib/Froxlor/Validate/Validate.php b/lib/Froxlor/Validate/Validate.php
index fa8e21af..3fd0d410 100644
--- a/lib/Froxlor/Validate/Validate.php
+++ b/lib/Froxlor/Validate/Validate.php
@@ -108,7 +108,7 @@ class Validate
 			$ip_cidr = explode("/", $ip);
 			if (count($ip_cidr) == 2) {
 				$ip = $ip_cidr[0];
-				if(in_array((int)strlen((string)$ip_cidr[1]),array(1,2))) {
+				if (strlen($ip_cidr[1]) <= 2) {
 				    $ip_cidr[1] = self::cidr2NetmaskAddr($org_ip);
                 }
 				$cidr = "/" . $ip_cidr[1];