diff --git a/tests/Tests/ORM/Mapping/NamingStrategy/CustomPascalNamingStrategy.php b/tests/Tests/ORM/Mapping/NamingStrategy/CustomPascalNamingStrategy.php
index 104665aaa4e..fb3349cd936 100644
--- a/tests/Tests/ORM/Mapping/NamingStrategy/CustomPascalNamingStrategy.php
+++ b/tests/Tests/ORM/Mapping/NamingStrategy/CustomPascalNamingStrategy.php
@@ -20,8 +20,8 @@ class CustomPascalNamingStrategy implements NamingStrategy
      */
     public function classToTableName(string $className): string
     {
-        if (false !== mb_strpos($className, '\\')) {
-            return mb_substr($className, mb_strrpos($className, '\\') + 1);
+        if (false !== strpos($className, '\\')) {
+            return substr($className, strrpos($className, '\\') + 1);
         }
 
         return $className;
@@ -37,7 +37,7 @@ public function classToTableName(string $className): string
      */
     public function propertyToColumnName(string $propertyName, ?string $className = null): string
     {
-        if (null !== $className && mb_strtolower($propertyName) == mb_strtolower($this->classToTableName($className)) . 'id') {
+        if (null !== $className && strtolower($propertyName) == strtolower($this->classToTableName($className)) . 'id') {
             return 'Id';
         }