diff --git a/src/neo/Wallets/NEP6/NEP6Wallet.cs b/src/neo/Wallets/NEP6/NEP6Wallet.cs
index 2db4d87e77..423e079dbf 100644
--- a/src/neo/Wallets/NEP6/NEP6Wallet.cs
+++ b/src/neo/Wallets/NEP6/NEP6Wallet.cs
@@ -302,14 +302,14 @@ public override bool VerifyPassword(string password)
             }
         }
 
-        public bool ChangePassword(string password_old, string password_new)
+        public override bool ChangePassword(string oldPassword, string newPassword)
         {
             bool succeed = true;
             lock (accounts)
             {
                 Parallel.ForEach(accounts.Values, (account, state) =>
                 {
-                    if (!account.ChangePasswordPrepare(password_old, password_new))
+                    if (!account.ChangePasswordPrepare(oldPassword, newPassword))
                     {
                         state.Stop();
                         succeed = false;
@@ -321,7 +321,7 @@ public bool ChangePassword(string password_old, string password_new)
                 foreach (NEP6Account account in accounts.Values)
                     account.ChangePasswordCommit();
                 if (password != null)
-                    password = password_new;
+                    password = newPassword;
             }
             else
             {
diff --git a/src/neo/Wallets/SQLite/UserWallet.cs b/src/neo/Wallets/SQLite/UserWallet.cs
index 7cfbca8034..bea3626d34 100644
--- a/src/neo/Wallets/SQLite/UserWallet.cs
+++ b/src/neo/Wallets/SQLite/UserWallet.cs
@@ -170,10 +170,10 @@ private void BuildDatabase()
             }
         }
 
-        public bool ChangePassword(string password_old, string password_new)
+        public override bool ChangePassword(string oldPassword, string newPassword)
         {
-            if (!VerifyPassword(password_old)) return false;
-            byte[] passwordKey = password_new.ToAesKey();
+            if (!VerifyPassword(oldPassword)) return false;
+            byte[] passwordKey = newPassword.ToAesKey();
             try
             {
                 SaveStoredData("PasswordHash", passwordKey.Concat(salt).ToArray().Sha256());
diff --git a/src/neo/Wallets/Wallet.cs b/src/neo/Wallets/Wallet.cs
index 0c8151a257..4831a82c96 100644
--- a/src/neo/Wallets/Wallet.cs
+++ b/src/neo/Wallets/Wallet.cs
@@ -23,6 +23,7 @@ public abstract class Wallet
         public abstract string Name { get; }
         public abstract Version Version { get; }
 
+        public abstract bool ChangePassword(string oldPassword, string newPassword);
         public abstract bool Contains(UInt160 scriptHash);
         public abstract WalletAccount CreateAccount(byte[] privateKey);
         public abstract WalletAccount CreateAccount(Contract contract, KeyPair key = null);
diff --git a/tests/neo.UnitTests/Wallets/UT_Wallet.cs b/tests/neo.UnitTests/Wallets/UT_Wallet.cs
index a210cf581e..15a1cc8844 100644
--- a/tests/neo.UnitTests/Wallets/UT_Wallet.cs
+++ b/tests/neo.UnitTests/Wallets/UT_Wallet.cs
@@ -21,6 +21,11 @@ internal class MyWallet : Wallet
 
         Dictionary<UInt160, WalletAccount> accounts = new Dictionary<UInt160, WalletAccount>();
 
+        public override bool ChangePassword(string oldPassword, string newPassword)
+        {
+            throw new NotImplementedException();
+        }
+
         public override bool Contains(UInt160 scriptHash)
         {
             return accounts.ContainsKey(scriptHash);