diff --git a/typo3/sysext/rsaauth/Classes/RsaEncryptionEncoder.php b/typo3/sysext/rsaauth/Classes/RsaEncryptionEncoder.php
index 2b259fce6f4f3d72b0e90224013d4f7a7f4e103b..e1e28bdc9e988aee91a7153346c604e9333a7064 100644
--- a/typo3/sysext/rsaauth/Classes/RsaEncryptionEncoder.php
+++ b/typo3/sysext/rsaauth/Classes/RsaEncryptionEncoder.php
@@ -61,7 +61,7 @@ class RsaEncryptionEncoder implements SingletonInterface
             $pageRenderer->loadRequireJsModule('TYPO3/CMS/Rsaauth/RsaEncryptionModule');
         } else {
             // Register ajax handler url
-            $code = 'var TYPO3RsaEncryptionPublicKeyUrl = ' . GeneralUtility::quoteJSvalue(GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . 'index.php?eID=RsaPublicKeyGenerationController') . ';';
+            $code = 'var TYPO3RsaEncryptionPublicKeyUrl = ' . GeneralUtility::quoteJSvalue(GeneralUtility::getIndpEnv('TYPO3_SITE_PATH') . 'index.php?eID=RsaPublicKeyGenerationController') . ';';
             $pageRenderer->addJsInlineCode('TYPO3RsaEncryptionPublicKeyUrl', $code);
             $javascriptPath = ExtensionManagementUtility::siteRelPath('rsaauth') . 'Resources/Public/JavaScript/';
             if (!$GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['debug']) {