diff --git a/packages/smart-wallet/src/smartWallet.js b/packages/smart-wallet/src/smartWallet.js
index 1e5f981bf80..758c9f028ae 100644
--- a/packages/smart-wallet/src/smartWallet.js
+++ b/packages/smart-wallet/src/smartWallet.js
@@ -364,7 +364,6 @@ export const prepareSmartWallet = (baggage, shared) => {
         AmountShape,
         M.remotable('InvitationMaker'),
         M.or(M.record(), M.undefined()),
-        M.string(),
       ).returns(M.promise()),
       purseForBrand: M.call(BrandShape).returns(M.promise()),
     }),
diff --git a/packages/swingset-liveslots/tools/fakeVirtualSupport.js b/packages/swingset-liveslots/tools/fakeVirtualSupport.js
index c38d0601765..f67570358ad 100644
--- a/packages/swingset-liveslots/tools/fakeVirtualSupport.js
+++ b/packages/swingset-liveslots/tools/fakeVirtualSupport.js
@@ -159,8 +159,10 @@ export function makeFakeLiveSlotsStuff(options = {}) {
     return exportID;
   }
 
+  let nextPromiseID = 5;
   function allocatePromiseID() {
-    const promiseID = vrm.allocateNextID('promiseID');
+    const promiseID = nextPromiseID;
+    nextPromiseID += 1;
     return makeVatSlot('promise', true, promiseID);
   }