diff --git a/third_party/json11/json11.cpp b/third_party/json11/json11.cpp
index bc4045f07d..3bd4fde2f2 100644
--- a/third_party/json11/json11.cpp
+++ b/third_party/json11/json11.cpp
@@ -25,6 +25,7 @@
 #include <cstdlib>
 #include <cstdio>
 #include <limits>
+#include <cstdint>
 
 namespace json11 {