diff --git a/src/Utils.h b/src/Utils.h
index 628664c..1435dac 100644
--- a/src/Utils.h
+++ b/src/Utils.h
@@ -7,7 +7,7 @@
 #include "Arduino_POSIXStorage.h"
 #include <iostream>
 
-#if !defined(HAS_SERIAL) && defined(HAS_RS485)
+#if !defined(HAS_SERIAL) && defined(HAS_RS485) && __has_include(<ArduinoRS485.h>)
 #include <ArduinoRS485.h>