diff --git a/extension/Classes/Core/Store/Config.php b/extension/Classes/Core/Store/Config.php
index 5bcf797f84eac085139ec1079883b311c08d3571..fce48c6b1062b220b2ab2968841ee9357ea7e11b 100644
--- a/extension/Classes/Core/Store/Config.php
+++ b/extension/Classes/Core/Store/Config.php
@@ -166,6 +166,7 @@ class Config {
         $absoluteConf = Path::absoluteConf();
         HelperFile::createPathRecursive($absoluteConf);
         HelperFile::file_put_contents(Path::join($absoluteConf, CONFIG_QFQ_JSON), json_encode($config, JSON_PRETTY_PRINT));
+        chmod(Path::join($absoluteConf, CONFIG_QFQ_JSON), 0640);
     }
 
     /**