diff --git a/fido2/log.h b/fido2/log.h
index e7fa99c..19e8d8d 100644
--- a/fido2/log.h
+++ b/fido2/log.h
@@ -2,6 +2,7 @@
 #define _LOG_H
 
 #include "app.h"
+#include <stdint.h>
 
 #ifndef DEBUG_LEVEL
 #define DEBUG_LEVEL 0
diff --git a/fido2/util.c b/fido2/util.c
index 311155d..d996952 100644
--- a/fido2/util.c
+++ b/fido2/util.c
@@ -1,3 +1,4 @@
+#include <stdint.h>
 #include <stdio.h>
 
 void dump_hex(uint8_t * buf, int size)
diff --git a/fido2/util.h b/fido2/util.h
index 9f010f3..b829b49 100644
--- a/fido2/util.h
+++ b/fido2/util.h
@@ -1,6 +1,7 @@
 #ifndef _UTIL_H
 #define _UTIL_H
 
+#include <stdint.h>
 
 void dump_hex(uint8_t * buf, int size);