diff --git a/v8/src/base/template-utils.h b/src/base/template-utils.h
index 8f89672e1a..64a4cb0996 100644
--- a/v8/src/base/template-utils.h
+++ b/v8/src/base/template-utils.h
@@ -6,6 +6,7 @@
 #define V8_BASE_TEMPLATE_UTILS_H_
 
 #include <array>
+#include <ostream>
 #include <functional>
 #include <type_traits>
 #include <utility>