diff --git a/flight/Libraries/aes.c b/flight/Libraries/aes.c
index d381f157a..c21ce2f9e 100644
--- a/flight/Libraries/aes.c
+++ b/flight/Libraries/aes.c
@@ -1,7 +1,7 @@
 
 // http://gladman.plushost.co.uk/oldsite/AES/index.php
 
-//#include <stdio.h>
+#include <stdint.h>
 
 #include "aes.h"