diff --git a/components/ratgdo/ratgdo.h b/components/ratgdo/ratgdo.h
index 955fbc4..d925bcb 100644
--- a/components/ratgdo/ratgdo.h
+++ b/components/ratgdo/ratgdo.h
@@ -14,6 +14,7 @@
 #pragma once
 #include "esphome/core/component.h"
 #include "esphome/core/preferences.h"
+#include <Arduino.h>
 
 
 #include "SoftwareSerial.h"