diff --git a/src/Diff/FilterUtil.php b/src/Diff/FilterUtil.php
index 019371e..72497c3 100644
--- a/src/Diff/FilterUtil.php
+++ b/src/Diff/FilterUtil.php
@@ -29,9 +29,8 @@ abstract class FilterUtil
      */
     public static function sanitize(array $filter): array
     {
-        return array_filter($filter, fn($e) => in_array($e, ['A', 'C', 'D', 'M', 'R', 'T', 'U', 'X', 'B', '*']) );
+        return array_filter($filter, function ($e) {
+            return in_array($e, ['A', 'C', 'D', 'M', 'R', 'T', 'U', 'X', 'B', '*']);
+        });
     }
 }
-
-
-