diff --git a/radio/src/targets/sky9x/board.h b/radio/src/targets/sky9x/board.h
index 3fae91ec2..84a8cfd67 100644
--- a/radio/src/targets/sky9x/board.h
+++ b/radio/src/targets/sky9x/board.h
@@ -22,6 +22,7 @@
 #define _BOARD_SKY9X_H_
 
 #include <inttypes.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include "board_lowlevel.h"
 #include "audio_driver.h"