diff --git a/tests/performance/wp-content/mu-plugins/server-timing.php b/tests/performance/wp-content/mu-plugins/server-timing.php
index 8d7e7ae3aa..9ae95561ec 100644
--- a/tests/performance/wp-content/mu-plugins/server-timing.php
+++ b/tests/performance/wp-content/mu-plugins/server-timing.php
@@ -1,8 +1,8 @@
 <?php
 
-add_action(
-	'template_redirect',
-	static function() {
+add_filter(
+	'template_include',
+	static function( $template ) {
 
 		global $timestart;
 
@@ -38,6 +38,8 @@ add_action(
 			},
 			PHP_INT_MIN
 		);
+
+		return $template;
 	},
 	PHP_INT_MAX
 );