diff --git a/module/VuFind/tests/unit-tests/src/VuFindTest/View/Helper/Root/OpenUrlTest.php b/module/VuFind/tests/unit-tests/src/VuFindTest/View/Helper/Root/OpenUrlTest.php
index a76a7c89d80678a83c73e17a829a1392bd65a93b..e1f1d34e36088ae04959d31285dd70c928e39dea 100644
--- a/module/VuFind/tests/unit-tests/src/VuFindTest/View/Helper/Root/OpenUrlTest.php
+++ b/module/VuFind/tests/unit-tests/src/VuFindTest/View/Helper/Root/OpenUrlTest.php
@@ -298,7 +298,7 @@ class OpenUrlTest extends \VuFindTest\Unit\ViewHelperTestCase
             $mockContext = $this->getMockContext();
         }
         $mockPm = $this->getMockBuilder('VuFind\Resolver\Driver\PluginManager')
-            ->getMock();
+            ->disableOriginalConstructor()->getMock();
         $openUrl = new OpenUrl($mockContext, $rules, $mockPm, new Config($config));
         $openUrl->setView($this->getPhpRenderer());
         return $openUrl;