diff --git a/json11.cpp b/json11.cpp
index 9647846..8266a14 100644
--- a/json11.cpp
+++ b/json11.cpp
@@ -22,6 +22,7 @@
 #include "json11.hpp"
 #include <cassert>
 #include <cmath>
+#include <cstdint>
 #include <cstdlib>
 #include <cstdio>
 #include <limits>