diff --git a/tests/phpunit/tests/comment-submission.php b/tests/phpunit/tests/comment-submission.php
index eb52fb0efb..6864c776b0 100644
--- a/tests/phpunit/tests/comment-submission.php
+++ b/tests/phpunit/tests/comment-submission.php
@@ -811,7 +811,7 @@ class Tests_Comment_Submission extends WP_UnitTestCase {
 		remove_filter( 'preprocess_comment', array( $this, 'filter_preprocess_comment' ) );
 
 		$this->assertNotWPError( $comment );
-		$this->assertSameSets(
+		$this->assertSameSetsWithIndex(
 			array(
 				'comment_post_ID'      => self::$post->ID,
 				'comment_author'       => $user->display_name,