diff --git a/src/radio/radio.c b/src/radio/radio.c
index bc2ca98..74d7424 100644
--- a/src/radio/radio.c
+++ b/src/radio/radio.c
@@ -8,6 +8,7 @@
 #include "../driver/sx126x-board.h"
 #include "../loramac/utilities.h"
 #include "../radio/radio.h"
+#include "Arduino.h"
 
 
 /*!
@@ -1239,4 +1240,4 @@ void RadioIrqProcess( void )
         }
     }
 }
-#endif
\ No newline at end of file
+#endif