diff --git a/banking/src/main/java/io/github/gunkim/banking/domain/Account.java b/banking/src/main/java/io/github/gunkim/banking/domain/Account.java
index d155362..b14d7b2 100644
--- a/banking/src/main/java/io/github/gunkim/banking/domain/Account.java
+++ b/banking/src/main/java/io/github/gunkim/banking/domain/Account.java
@@ -1,12 +1,18 @@
 package io.github.gunkim.banking.domain;
 
 public class Account {
+    private final AccountId id;
     private Money balance;
 
-    public Account(Money balance) {
+    public Account(AccountId id, Money balance) {
+        this.id = id;
         this.balance = balance;
     }
 
+    public Account(Money balance) {
+        this(AccountId.createRandom(), balance);
+    }
+
     public Money deposit(Money amount) {
         this.balance = this.balance.plus(amount);