diff --git a/radio/src/targets/sky9x/board.h b/radio/src/targets/sky9x/board.h
index 851cba126..3fae91ec2 100644
--- a/radio/src/targets/sky9x/board.h
+++ b/radio/src/targets/sky9x/board.h
@@ -21,6 +21,7 @@
 #ifndef _BOARD_SKY9X_H_
 #define _BOARD_SKY9X_H_
 
+#include <inttypes.h>
 #include <stdio.h>
 #include "board_lowlevel.h"
 #include "audio_driver.h"