diff --git a/src/main/java/nl/sogyo/boilerplate/service/AccountService.java b/src/main/java/nl/sogyo/boilerplate/service/AccountService.java
index 91db43f..89ac6bf 100644
--- a/src/main/java/nl/sogyo/boilerplate/service/AccountService.java
+++ b/src/main/java/nl/sogyo/boilerplate/service/AccountService.java
@@ -9,5 +9,5 @@ public interface AccountService {
 	public List<SavingsAccount> getSavingsAccounts();
 	public SavingsAccount getSavingsAccount(int accountId);
 	public void createSavingsAccount(SavingsAccount savingsAccount);
-	public void updateSavingsAccount(int accountId, SavingsAccount savingsAccount);
+	public void updateSavingsAccount(String accountId, SavingsAccount savingsAccount);
 }