diff --git a/staging/tools.c b/staging/tools.c
index 9d2d1be..909b059 100644
--- a/staging/tools.c
+++ b/staging/tools.c
@@ -55,6 +55,7 @@
 ////////////////////////////////////////////////////////////////////////////////////////////
 
 #include "mz.h"
+#include <stdint.h>
 
 #define CMP_INT(a, b) ((a) < (b) ? -1 : (a) > (b))
 #define IPV6_MAX_RANGE_LEN strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff-ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")