diff --git a/tools/mfd_aes_brute/brute_key.c b/tools/mfd_aes_brute/brute_key.c
index aa6c532fd..41c91f3c7 100644
--- a/tools/mfd_aes_brute/brute_key.c
+++ b/tools/mfd_aes_brute/brute_key.c
@@ -22,6 +22,8 @@
 // makes it ~14% slower
 //#define SPINNER
 
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>