diff --git a/typo3/sysext/backend/Classes/Controller/BackendController.php b/typo3/sysext/backend/Classes/Controller/BackendController.php
index 7f1db931a98626d66fe1193026e3f211e9a5ef39..964ae737f315095d129ec6c1c4758f6b27adfe77 100644
--- a/typo3/sysext/backend/Classes/Controller/BackendController.php
+++ b/typo3/sysext/backend/Classes/Controller/BackendController.php
@@ -240,7 +240,7 @@ class BackendController
         $extConf = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('backend');
         $logoPath = '';
         if (!empty($extConf['backendLogo'])) {
-            $customBackendLogo = GeneralUtility::getFileAbsFileName($extConf['backendLogo']);
+            $customBackendLogo = GeneralUtility::getFileAbsFileName(ltrim($extConf['backendLogo'], '/'));
             if (!empty($customBackendLogo)) {
                 $logoPath = $customBackendLogo;
             }