diff --git a/FsCrypt.h b/FsCrypt.h
index be21fba..d4a482c 100644
--- a/FsCrypt.h
+++ b/FsCrypt.h
@@ -36,3 +36,4 @@
 bool fscrypt_destroy_user_storage(const std::string& volume_uuid, userid_t user_id, int flags);
 
 bool fscrypt_destroy_volume_keys(const std::string& volume_uuid);
+bool is_metadata_wrapped_key_supported();