diff --git a/core/tests/Drupal/Tests/Core/Cache/Context/SessionCacheContextTest.php b/core/tests/Drupal/Tests/Core/Cache/Context/SessionCacheContextTest.php
index 984c4ab686..a8cf6fb3dc 100644
--- a/core/tests/Drupal/Tests/Core/Cache/Context/SessionCacheContextTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/Context/SessionCacheContextTest.php
@@ -89,7 +89,6 @@ public function testDifferentContextForDifferentSession() {
 
   /**
    * @covers ::getContext
-   * @runInSeparateProcess
    */
   public function testContextWithoutSessionInRequest() {
     $cache_context = new SessionCacheContext($this->requestStack);