diff --git a/cpp/src/phonenumbers/metadata_bytes.h b/cpp/src/phonenumbers/metadata_bytes.h
index cd7db1d2fa..39690fd2e9 100644
--- a/cpp/src/phonenumbers/metadata_bytes.h
+++ b/cpp/src/phonenumbers/metadata_bytes.h
@@ -19,6 +19,7 @@
 
 #include <cstdint>
 #include <memory>
+#include <utility>
 
 namespace i18n {
 namespace phonenumbers {