diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c
index 7a4e5e76e6..ab0b52afd1 100644
--- a/platforms/avr/drivers/serial.c
+++ b/platforms/avr/drivers/serial.c
@@ -16,6 +16,7 @@
 #include <util/delay.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include "gpio.h"
 #include "serial.h"
 
 #ifdef SOFT_SERIAL_PIN