diff --git a/libraries/src/Form/Filter/UrlFilter.php b/libraries/src/Form/Filter/UrlFilter.php
index 93134180f4fd9..e88884d4e75c6 100644
--- a/libraries/src/Form/Filter/UrlFilter.php
+++ b/libraries/src/Form/Filter/UrlFilter.php
@@ -62,7 +62,7 @@ public function filter(\SimpleXMLElement $element, $value, $group = null, Regist
         // we assume that it is an external URL and prepend http://
         if (
             ((string) $element['type'] === 'url' && !$protocol && !$element['relative'])
-            || (!(string) $element['type'] === 'url' && !$protocol)
+            || ((string) $element['type'] !== 'url' && !$protocol)
         ) {
             $protocol = 'http';