diff --git a/Grbl_Esp32/grbl.h b/Grbl_Esp32/grbl.h
index aff71b70..decfd210 100644
--- a/Grbl_Esp32/grbl.h
+++ b/Grbl_Esp32/grbl.h
@@ -23,7 +23,7 @@
 #define GRBL_VERSION_BUILD "20180919"
 
 //#include <sdkconfig.h>
-#include <arduino.h>
+#include <Arduino.h>
 #include <EEPROM.h>
 #include <driver/rmt.h>
 #include <esp_task_wdt.h>