diff --git a/exercises/practice/anagram/AnagramTest.php b/exercises/practice/anagram/AnagramTest.php
index 36cebf00..d7159d31 100644
--- a/exercises/practice/anagram/AnagramTest.php
+++ b/exercises/practice/anagram/AnagramTest.php
@@ -15,7 +15,7 @@ public static function setUpBeforeClass(): void
      */
     public function testNoMatches(): void
     {
-        $this->assertEqualsCanonicalizing([], detectAnagrams('diaper', ['hello', 'world', 'zombies', 'pants']));
+        $this->assertEqualsCanonicalizing([], array_values(detectAnagrams('diaper', ['hello', 'world', 'zombies', 'pants'])));
     }
 
     /**