diff --git a/src/modules/px4iofirmware/protocol.h b/src/modules/px4iofirmware/protocol.h
index c7e9ae3eb3..b25a9507f6 100644
--- a/src/modules/px4iofirmware/protocol.h
+++ b/src/modules/px4iofirmware/protocol.h
@@ -33,6 +33,8 @@
 
 #pragma once
 
+#include <stdint.h>
+
 /**
  * @file protocol.h
  *