diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index da39d3b2cd..8ff81b245f 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -626,7 +626,7 @@ public function testGet() {
     // 'Vary' headers are also added to the list of headers to ignore, as they
     // may be added to GET requests, depending on web server configuration. They
     // are usually 'Transfer-Encoding: chunked' and 'Vary: Accept-Encoding'.
-    $ignored_headers = ['Date', 'Content-Length', 'X-Drupal-Cache', 'X-Drupal-Dynamic-Cache', 'Transfer-Encoding', 'Vary'];
+    $ignored_headers = ['Date', 'Content-Length', 'X-Drupal-Cache', 'X-Drupal-Dynamic-Cache', 'Transfer-Encoding', 'Vary', 'Server-Timing'];
     $header_cleaner = function ($headers) use ($ignored_headers) {
       foreach ($headers as $header => $value) {
         if (strpos($header, 'X-Drupal-Assertion-') === 0 || in_array($header, $ignored_headers)) {