diff --git a/tools/mapjson/json11.cpp b/tools/mapjson/json11.cpp
index 3ac5f392a0..fcacdbeb39 100644
--- a/tools/mapjson/json11.cpp
+++ b/tools/mapjson/json11.cpp
@@ -23,6 +23,7 @@
 #include <cstdlib>
 #include <cstdio>
 #include <limits>
+#include <cstdint>
 
 namespace json11 {