diff --git a/drivers/avr/pio.h b/drivers/avr/pio.h
index e9c13f1..9381e84 100644
--- a/drivers/avr/pio.h
+++ b/drivers/avr/pio.h
@@ -32,7 +32,7 @@
 #define PIO_H
 
 #include "system.h"
-#ifdef AVR
+#ifdef __AVR__
 #include <avr/io.h>
 #endif