diff --git a/Classes/Driver/AmazonS3Driver.php b/Classes/Driver/AmazonS3Driver.php
index cc35dcb4..ae221972 100644
--- a/Classes/Driver/AmazonS3Driver.php
+++ b/Classes/Driver/AmazonS3Driver.php
@@ -1138,7 +1138,7 @@ protected function initializeClient()
             $configuration['http']['proxy'] = $GLOBALS['TYPO3_CONF_VARS']['HTTP']['proxy'];
         }
         if (!empty($this->configuration['signature'])) {
-            $configuration['signature_version'] = $this->configuration['signature_version'];
+            $configuration['signature_version'] = $this->configuration['signature'];
         }
         if (!empty($this->configuration['customHost'])) {
             $configuration['endpoint'] = $this->configuration['customHost'];