diff --git a/tools/mapjson/json11.cpp b/tools/mapjson/json11.cpp
index 3ac5f392a0..50c2209c57 100644
--- a/tools/mapjson/json11.cpp
+++ b/tools/mapjson/json11.cpp
@@ -20,6 +20,7 @@
 #include "json11.h"
 #include <cassert>
 #include <cmath>
+#include <cstdint>
 #include <cstdlib>
 #include <cstdio>
 #include <limits>