diff --git a/system/Filters/Filters.php b/system/Filters/Filters.php
index 6ecb30717673..121d251df63a 100644
--- a/system/Filters/Filters.php
+++ b/system/Filters/Filters.php
@@ -617,7 +617,7 @@ private function getCleanName(string $filter): array
         [$alias, $arguments] = explode(':', $filter);
 
         $arguments = explode(',', $arguments);
-        array_walk($arguments, static function (&$item) {
+        array_walk($arguments, static function (&$item): void {
             $item = trim($item);
         });