diff --git a/esp3d/command.cpp b/esp3d/command.cpp
index 6b4f4202..314f3a52 100644
--- a/esp3d/command.cpp
+++ b/esp3d/command.cpp
@@ -162,6 +162,7 @@ bool COMMAND::execute_command (int cmd, String cmd_params, tpipe output, level_a
 {
     bool response = true;
     level_authenticate_type auth_type = auth_level;
+    (void)auth_type;  //avoid warning if updater only
 #ifdef AUTHENTICATION_FEATURE
 
     if (isadmin(cmd_params)) {
diff --git a/esp3d/espcom.cpp b/esp3d/espcom.cpp
index 22803845..aac28216 100644
--- a/esp3d/espcom.cpp
+++ b/esp3d/espcom.cpp
@@ -390,6 +390,7 @@ void ESPCOM::send2TCP (const char * data, bool async)
 bool ESPCOM::processFromSerial (bool async)
 {
     uint8_t i;
+    (void)i; //avoid warning if updater only
     //check UART for data
     if (ESPCOM::available(DEFAULT_PRINTER_PIPE)) {
         size_t len = ESPCOM::available(DEFAULT_PRINTER_PIPE);