diff --git a/tests/text_formatter/s9e/mention_helper_test.php b/tests/text_formatter/s9e/mention_helper_test.php
index ea53557c78..26fc743841 100644
--- a/tests/text_formatter/s9e/mention_helper_test.php
+++ b/tests/text_formatter/s9e/mention_helper_test.php
@@ -118,6 +118,6 @@ class mention_helper_test extends phpbb_database_test_case
 	 */
 	public function test_get_mentioned_user_ids($incoming_xml, $expected_result)
 	{
-		$this->assertSame($expected_result, $this->mention_helper->get_mentioned_user_ids($incoming_xml));
+		$this->assertEqualsCanonicalizing($expected_result, $this->mention_helper->get_mentioned_user_ids($incoming_xml));
 	}
 }