diff --git a/FsCrypt.h b/FsCrypt.h
index f5c367c..afcedfb 100644
--- a/FsCrypt.h
+++ b/FsCrypt.h
@@ -23,17 +23,16 @@
 
 bool fscrypt_init_user0();
 extern bool fscrypt_init_user0_done;
-bool fscrypt_create_user_keys(userid_t user_id, int serial, bool ephemeral);
+bool fscrypt_create_user_keys(userid_t user_id, bool ephemeral);
 bool fscrypt_destroy_user_keys(userid_t user_id);
 bool fscrypt_set_ce_key_protection(userid_t user_id, const std::string& secret);
 void fscrypt_deferred_fixate_ce_keys();
 
 std::vector<int> fscrypt_get_unlocked_users();
-bool fscrypt_unlock_ce_storage(userid_t user_id, int serial, const std::string& secret);
+bool fscrypt_unlock_ce_storage(userid_t user_id, const std::string& secret);
 bool fscrypt_lock_ce_storage(userid_t user_id);
 
-bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_id, int serial,
-                                  int flags);
+bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_id, int flags);
 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);