.../modules/dblog/tests/src/Functional/DbLogResourceTest.php |  2 +-
 core/modules/rest/tests/src/Functional/ResourceTestBase.php  | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php b/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php
index fc22d49182..348ceff847 100644
--- a/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php
+++ b/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php
@@ -67,7 +67,7 @@ public function testWatchdog() {
     $request_options = $this->getAuthenticationRequestOptions('GET');
 
     $response = $this->request('GET', $url, $request_options);
-    $this->assertResourceErrorResponse(403, "The 'restful get dblog' permission is required.", $response, ['4xx-response', 'http_response'], ['user.permissions'], FALSE, FALSE);
+    $this->assertResourceErrorResponse(403, "The 'restful get dblog' permission is required.", $response, ['4xx-response', 'http_response'], ['user.permissions'], 'UNCACHEABLE (request policy)', FALSE);
 
     // Create a user account that has the required permissions to read
     // the watchdog resource via the REST API.
diff --git a/core/modules/rest/tests/src/Functional/ResourceTestBase.php b/core/modules/rest/tests/src/Functional/ResourceTestBase.php
index 06204b3bc0..0d994d0cb7 100644
--- a/core/modules/rest/tests/src/Functional/ResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/ResourceTestBase.php
@@ -422,8 +422,16 @@ protected function assertResourceResponse($expected_status_code, $expected_body,
       $this->assertSame($expected_dynamic_page_cache_header_value, $response->getHeader('X-Drupal-Dynamic-Cache')[0]);
     }
     else {
-      $this->assertTrue($response->hasHeader('X-Drupal-Dynamic-Cache'));
-      $this->stringStartsWith('UNCACHEABLE (', $response->getHeader('X-Drupal-Dynamic-Cache')[0]);
+      if ($expected_status_code === 403) {
+        if ($response->hasHeader('X-Drupal-Dynamic-Cache')) {
+          $this->assertTrue($response->hasHeader('X-Drupal-Dynamic-Cache'));
+          $this->stringStartsWith('UNCACHEABLE (', $response->getHeader('X-Drupal-Dynamic-Cache')[0]);
+        }
+      }
+      else {
+        $this->assertTrue($response->hasHeader('X-Drupal-Dynamic-Cache'));
+        $this->stringStartsWith('UNCACHEABLE (', $response->getHeader('X-Drupal-Dynamic-Cache')[0]);
+      }
     }
   }