diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
index 702fdb2..bd1c030 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
@@ -135,6 +135,10 @@
   function __construct($test_id = NULL) {
     parent::__construct($test_id);
     $this->zlibInstalled = function_exists('gzopen');
+    // Disable opcache for the testrunner for update path tests. Update path
+    // tests use massive php files to load the database and putting these in
+    // opcache can cuase problems.
+    ini_set('opcache.enable', '0');
   }
 
   /**