diff --git a/typo3/sysext/install/Classes/Service/CoreUpdateService.php b/typo3/sysext/install/Classes/Service/CoreUpdateService.php
index 09e4d5f..cb76387 100644
--- a/typo3/sysext/install/Classes/Service/CoreUpdateService.php
+++ b/typo3/sysext/install/Classes/Service/CoreUpdateService.php
@@ -94,7 +94,7 @@ class CoreUpdateService {
 	 * @return boolean
 	 */
 	public function isCoreUpdateEnabled() {
-		return (getenv('TYPO3_DISABLE_CORE_UPDATER') !== '1');
+		return (getenv('TYPO3_DISABLE_CORE_UPDATER') !== '1' && getenv('REDIRECT_TYPO3_DISABLE_CORE_UPDATER') !== '1');
 	}
 
 	/**