diff --git a/packages/inter-protocol/src/auction/auctionBook.js b/packages/inter-protocol/src/auction/auctionBook.js
index df65ba02847..d5536768e8a 100644
--- a/packages/inter-protocol/src/auction/auctionBook.js
+++ b/packages/inter-protocol/src/auction/auctionBook.js
@@ -10,7 +10,6 @@ import { M, prepareExoClassKit } from '@agoric/vat-data';
 
 import { assertAllDefined, makeTracer } from '@agoric/internal';
 import {
-  atomicRearrange,
   ceilMultiplyBy,
   makeRatioFromAmounts,
   makeRecorderTopic,
@@ -311,8 +310,7 @@ export const prepareAuctionBook = (baggage, zcf, makeRecorderKit) => {
             seat.exit('unable to satisfy want');
           }
 
-          atomicRearrange(
-            zcf,
+          zcf.atomicRearrange(
             harden([
               [collateralSeat, seat, { Collateral: collateralTarget }],
               [seat, bidHoldingSeat, { Bid: proceedsTarget }],
@@ -569,8 +567,7 @@ export const prepareAuctionBook = (baggage, zcf, makeRecorderKit) => {
             state.startProceedsGoal = nextProceedsGoal;
           }
 
-          atomicRearrange(
-            zcf,
+          zcf.atomicRearrange(
             harden([[sourceSeat, collateralSeat, { Collateral: assetAmount }]]),
           );
 
diff --git a/packages/inter-protocol/src/auction/auctioneer.js b/packages/inter-protocol/src/auction/auctioneer.js
index 3b475137f5c..1eed4c9d48a 100644
--- a/packages/inter-protocol/src/auction/auctioneer.js
+++ b/packages/inter-protocol/src/auction/auctioneer.js
@@ -12,7 +12,6 @@ import { mustMatch } from '@agoric/store';
 import { appendToStoredArray } from '@agoric/store/src/stores/store-utils.js';
 import { M, provideDurableMapStore } from '@agoric/vat-data';
 import {
-  atomicRearrange,
   ceilDivideBy,
   ceilMultiplyBy,
   defineERecorderKit,
@@ -490,8 +489,7 @@ export const start = async (zcf, privateArgs, baggage) => {
         // send it all to the one
         const liqSeat = depositsForBrand[0].seat;
 
-        atomicRearrange(
-          zcf,
+        zcf.atomicRearrange(
           harden([
             [collateralSeat, liqSeat, collateralSeat.getCurrentAllocation()],
             [bidHoldingSeat, liqSeat, bidHoldingSeat.getCurrentAllocation()],
@@ -514,7 +512,7 @@ export const start = async (zcf, privateArgs, baggage) => {
           reserveSeat,
           brand,
         );
-        atomicRearrange(zcf, harden(transfers));
+        zcf.atomicRearrange(harden(transfers));
 
         for (const { seat } of depositsForBrand) {
           seat.exit();