diff --git a/packages/fast-usdc/test/clientSupport.test.js b/packages/fast-usdc/test/clientSupport.test.js
index abee8bdf423..490e126d0ca 100644
--- a/packages/fast-usdc/test/clientSupport.test.js
+++ b/packages/fast-usdc/test/clientSupport.test.js
@@ -4,9 +4,10 @@ import { Offers } from '../src/clientSupport.js';
 
 const usdc = makeIssuerKit('USDC');
 
-/** @satisfies {import('@agoric/vats/tools/board-utils.js').AgoricNamesRemotes} */
+/** @type {import('@agoric/vats/tools/board-utils.js').AgoricNamesRemotes} */
 const agoricNames = {
   brand: {
+    // @ts-expect-error not a real BoardRemote
     USDC: usdc.brand,
   },
   // Other required AgoricNames properties...
@@ -15,12 +16,11 @@ const agoricNames = {
 const instance = /** @type {Instance} */ ({});
 
 test('makeDepositOffer', async t => {
-  const offer = Offers.fastUsdc.Deposit(
-    agoricNames,
-    instance,
-    { offerId: 'deposit1', amount: 100 }
-  );
-  
+  const offer = Offers.fastUsdc.Deposit(agoricNames, instance, {
+    offerId: 'deposit1',
+    amount: 100,
+  });
+
   t.deepEqual(offer, {
     id: 'deposit1',
     invitationSpec: {
@@ -32,30 +32,30 @@ test('makeDepositOffer', async t => {
       give: {
         Deposit: {
           brand: agoricNames.brand.USDC,
-          value: 100000000n
-        }
-      }
-    }
+          value: 100000000n,
+        },
+      },
+    },
   });
 });
 
 test('makeWithdrawOffer', async t => {
-  const offer = Offers.fastUsdc.Withdraw(
-    agoricNames,
-    instance,
-    { offerId: 'withdraw1', amount: 50 }
-  );
-  
-  t.deepEqual(offer.proposal.want.Withdrawal.value, 50000000n);
+  const offer = Offers.fastUsdc.Withdraw(agoricNames, instance, {
+    offerId: 'withdraw1',
+    amount: 50,
+  });
+
+  t.deepEqual(offer.proposal.want?.Withdrawal.value, 50000000n);
 });
 
 test('makeOperatorOffer', async t => {
-  const offer = Offers.fastUsdc.BecomeOperator(
-    instance,
-    { offerId: 'operator1', operatorId: 'op123' }
-  );
-  
+  const offer = Offers.fastUsdc.BecomeOperator(instance, {
+    offerId: 'operator1',
+    operatorId: 'op123',
+  });
+
+  // @ts-expect-error invitationSpec is AgoricContractInvitationSpec but offer doesn't carry that type
   t.deepEqual(offer.invitationSpec.callPipe, [
-    ['makeOperatorInvitation', ['op123']]
+    ['makeOperatorInvitation', ['op123']],
   ]);
 });