diff --git a/common/hex.c b/common/hex.c
index f3d3b6c2..e8c0ec68 100644
--- a/common/hex.c
+++ b/common/hex.c
@@ -40,6 +40,7 @@
 #include "debug.h"
 #include "hex.h"
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>