diff --git a/src/main/ts/wallet/MoneroWallet.ts b/src/main/ts/wallet/MoneroWallet.ts
index 61f220da1..bd316283f 100644
--- a/src/main/ts/wallet/MoneroWallet.ts
+++ b/src/main/ts/wallet/MoneroWallet.ts
@@ -69,6 +69,7 @@ export default class MoneroWallet {
   protected connectionManager: MoneroConnectionManager;
   protected connectionManagerListener: MoneroConnectionManagerListener;
   protected listeners: MoneroWalletListener[] = [];
+  protected _isClosed = false;
 
   /**
    * Hidden constructor.
@@ -1382,6 +1383,7 @@ export default class MoneroWallet {
     this.connectionManager = undefined;
     this.connectionManagerListener = undefined;
     this.listeners.splice(0, this.listeners.length);
+    this._isClosed = true;
   }
   
   /**
@@ -1390,7 +1392,7 @@ export default class MoneroWallet {
    * @return {Promise<boolean>} true if the wallet is closed, false otherwise
    */
   async isClosed(): Promise<boolean> {
-    throw new MoneroError("Not supported");
+    return this._isClosed;
   }
   
   // -------------------------------- PRIVATE ---------------------------------
diff --git a/src/main/ts/wallet/MoneroWalletKeys.ts b/src/main/ts/wallet/MoneroWalletKeys.ts
index b0a07bae1..534971b07 100644
--- a/src/main/ts/wallet/MoneroWalletKeys.ts
+++ b/src/main/ts/wallet/MoneroWalletKeys.ts
@@ -20,7 +20,6 @@ export class MoneroWalletKeys extends MoneroWallet {
   protected cppAddress: string;
   protected module: any;
   protected walletProxy: MoneroWalletKeysProxy;
-  protected _isClosed: boolean;
   
   // --------------------------- STATIC UTILITIES -----------------------------
   
@@ -169,7 +168,6 @@ export class MoneroWalletKeys extends MoneroWallet {
    */
   constructor(cppAddress, walletProxy?: MoneroWalletKeysProxy) {
     super();
-    this._isClosed = false;
     if (!cppAddress && !walletProxy) throw new MoneroError("Must provide cppAddress or walletProxy");
     if (walletProxy) this.walletProxy = walletProxy;
     else {