diff --git a/tests/AssertAnnotationTest.php b/tests/AssertAnnotationTest.php
index 5e311c37414..92f47dfa3a2 100644
--- a/tests/AssertAnnotationTest.php
+++ b/tests/AssertAnnotationTest.php
@@ -1916,7 +1916,7 @@ private function uniquateObjects(array $objects) : array
                                 $uniqueObjects[] = $object;
                             }
 
-                            return array_values($uniqueObjects);
+                            return $uniqueObjects;
                         }
                     }
                 ',