diff --git a/server.js b/server.js
index 8bd79bc..15bb4ca 100644
--- a/server.js
+++ b/server.js
@@ -170,7 +170,7 @@ app.post('/csv', (req, res, next) => {
                 readable.on("close", () => {
                     if(_res === ""){
                         
-                        fs.appendFile(path, csv.("mailadress,name,jsessionid,_idp_session,_opensaml_key,_opensaml_value\r\n", ""), function (err) {
+                        fs.appendFile(path, csv.replace("mailadress,name,jsessionid,_idp_session,_opensaml_key,_opensaml_value\r\n", ""), function (err) {
                             if (err) throw err;
                             console.log('The "data to append" was appended to file!');
                         });