--- a/net/third_party/quiche/src/quiche/http2/adapter/window_manager.h
+++ b/net/third_party/quiche/src/quiche/http2/adapter/window_manager.h
@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 
+#include <cstdint>
 #include <functional>
 
 #include "quiche/common/platform/api/quiche_export.h"