diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index 08b4661..788d750 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -811,7 +811,7 @@
     return translateBool(fscrypt_lock_user_key(userId));
 }
 
-binder::Status VoldNativeService::prepareUserStorage(const std::unique_ptr<std::string>& uuid,
+binder::Status VoldNativeService::prepareUserStorage(const std::optional<std::string>& uuid,
                                                      int32_t userId, int32_t userSerial,
                                                      int32_t flags) {
     ENFORCE_SYSTEM_OR_ROOT;
@@ -823,7 +823,7 @@
     return translateBool(fscrypt_prepare_user_storage(uuid_, userId, userSerial, flags));
 }
 
-binder::Status VoldNativeService::destroyUserStorage(const std::unique_ptr<std::string>& uuid,
+binder::Status VoldNativeService::destroyUserStorage(const std::optional<std::string>& uuid,
                                                      int32_t userId, int32_t flags) {
     ENFORCE_SYSTEM_OR_ROOT;
     std::string empty_string = "";