diff --git a/tools/mapjson/json11.cpp b/tools/mapjson/json11.cpp
index fcacdbeb39..74f9272313 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>