diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index 11d24045fd9012fc76dbd53e5bff837c61b5b780..01462cb6f8522d62500adeb7288303896d29df2b 100755
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -339,6 +339,7 @@ class OC_Mount_Config {
 		}
 		$content = json_encode($data);
 		@file_put_contents($file, $content);
+		@chmod($file, 0640);
 	}
 
 	/**