diff --git a/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php b/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
index 627e6c44499aa572b0ba8473b9d42d72ae2fe004..c2f16e309fb1deaf01eec958ca3ef45f18fd4a89 100644
--- a/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
+++ b/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
@@ -233,7 +233,7 @@ class ContentObjectRendererTest extends UnitTestCase
             ->method('getImgResourcePostProcess')
             ->willReturnCallback([$this, 'isGetImgResourceHookCalledCallback']);
         $getImgResourceHookObjects = [$getImgResourceHookMock];
-        $this->subject->_setRef('getImgResourceHookObjects', $getImgResourceHookObjects);
+        $this->subject->_set('getImgResourceHookObjects', $getImgResourceHookObjects);
         $this->subject->getImgResource('typo3/sysext/core/Tests/Unit/Utility/Fixtures/clear.gif', []);
     }