diff --git a/packages/smart-wallet/src/smartWallet.js b/packages/smart-wallet/src/smartWallet.js
index 0cb57c4809ea..e8b6edb6a88a 100644
--- a/packages/smart-wallet/src/smartWallet.js
+++ b/packages/smart-wallet/src/smartWallet.js
@@ -12,9 +12,10 @@ import {
   observeNotifier,
   prepareDurablePublishKit,
 } from '@agoric/notifier';
-import { M, makeScalarMapStore, mustMatch } from '@agoric/store';
+import { M, mustMatch } from '@agoric/store';
 import {
-  defineVirtualExoClassKit,
+  defineDurableExoClassKit,
+  makeKindHandle,
   makeScalarBigMapStore,
 } from '@agoric/vat-data';
 import { makeEphemeraProvider } from '@agoric/zoe/src/contractSupport/index.js';
@@ -227,7 +228,7 @@ export const prepareSmartWallet = (baggage, shared) => {
     const { walletStorageNode } = unique;
     const nonpreciousState = {
       // What purses have reported on construction and by getCurrentAmountNotifier updates.
-      purseBalances: makeScalarMapStore(),
+      purseBalances: makeScalarBigMapStore('purse balances', { durable: true }),
       /** @type {PublishKit<UpdateRecord>} */
       updatePublishKit,
       /** @type {PublishKit<CurrentWalletRecord>} */
@@ -274,8 +275,8 @@ export const prepareSmartWallet = (baggage, shared) => {
     }),
   };
 
-  return defineVirtualExoClassKit(
-    'SmartWallet',
+  return defineDurableExoClassKit(
+    makeKindHandle('SmartWallet'),
     behaviorGuards,
     initState,
     {