diff --git a/typo3/sysext/extbase/Tests/Unit/Utility/ExtensionUtilityTest.php b/typo3/sysext/extbase/Tests/Unit/Utility/ExtensionUtilityTest.php
index 7336cee0f05d809d3a821aa0409a480f64bbee2c..2235b34f9ee297a4a33be0b6ea6ab83dd33e666c 100644
--- a/typo3/sysext/extbase/Tests/Unit/Utility/ExtensionUtilityTest.php
+++ b/typo3/sysext/extbase/Tests/Unit/Utility/ExtensionUtilityTest.php
@@ -341,7 +341,8 @@ class ExtensionUtilityTest extends UnitTestCase
     {
         $typeConverterClassName = \TYPO3\CMS\Extbase\Property\TypeConverter\ArrayConverter::class;
 
-        $this->assertEmpty($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['extbase']['typeConverters']);
+        // the Extbase EXTCONF is not set at all at this point
+        $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['extbase']['typeConverters'] = [];
 
         \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerTypeConverter($typeConverterClassName);