diff --git a/src/ESP32_FTPClient.cpp b/src/ESP32_FTPClient.cpp
index 5dadb22..beeb8de 100644
--- a/src/ESP32_FTPClient.cpp
+++ b/src/ESP32_FTPClient.cpp
@@ -147,13 +147,13 @@ void ESP32_FTPClient::OpenConnection() {
   GetFTPAnswer();
 
   FTPdbgn("Send USER");
-  client.print(F("USER "));
-  client.println(F(userName));
+  String userStr = "USER " + String(userName);
+  client.println(F(userStr.c_str()));
   GetFTPAnswer();
 
   FTPdbgn("Send PASSWORD");
-  client.print(F("PASS "));
-  client.println(F(passWord));
+  String passStr = "PASS " + String(passWord);
+  client.println(F(passStr.c_str()));
   GetFTPAnswer();
   
   FTPdbgn("Send SYST");
@@ -177,8 +177,8 @@ void ESP32_FTPClient::RenameFile(char* from, char* to) {
 void ESP32_FTPClient::NewFile (const char* fileName) {
   FTPdbgn("Send STOR");
   if(!isConnected()) return;
-  client.print(F("STOR "));
-  client.println(F(fileName));
+  String storStr = "STOR " + String(fileName);
+  client.println(F(storStr.c_str()));
   GetFTPAnswer();
 }