diff --git a/src/auction.js b/src/auction.js
index 881dee9f2de..c7780081d1b 100644
--- a/src/auction.js
+++ b/src/auction.js
@@ -163,11 +163,17 @@ export function newAuction({adUnits, adUnitCodes, callback, cbTimeout, labels, a
   let _nonBids = [];
 
   function addBidRequests(bidderRequests) { _bidderRequests = _bidderRequests.concat(bidderRequests); }
-  function addBidReceived(bidsReceived) { _bidsReceived = _bidsReceived.concat(bidsReceived); }
+  function addBidReceived(bidResponse) { _bidsReceived = _bidsReceived.concat(bidResponse); purgeBidOnExpiration(bidResponse); }
   function addBidRejected(bidsRejected) { _bidsRejected = _bidsRejected.concat(bidsRejected); }
   function addNoBid(noBid) { _noBids = _noBids.concat(noBid); }
   function addNonBids(seatnonbids) { _nonBids = _nonBids.concat(seatnonbids); }
 
+  function purgeBidOnExpiration(bidResponse) {
+    setTimeout(() => {
+      _bidsReceived = _bidsReceived.filter(bid => bid.adId !== bidResponse.adId);
+    }, bidResponse.ttl * 1000);
+  }
+
   function getProperties() {
     return {
       auctionId: _auctionId,
diff --git a/test/spec/auctionmanager_spec.js b/test/spec/auctionmanager_spec.js
index e5cdb66e75f..f9d6e0076ee 100644
--- a/test/spec/auctionmanager_spec.js
+++ b/test/spec/auctionmanager_spec.js
@@ -852,16 +852,40 @@ describe('auctionmanager.js', function () {
         config.resetConfig();
       });
 
-      it('are dropped after their last bid becomes stale (if minBidCacheTTL is set)', () => {
+      it('are dropped after `minBidCacheTTL` seconds if they had no bid', () => {
+        auction.callBids();
         config.setConfig({
-          minBidCacheTTL: 0
+          minBidCacheTTL: 2
         });
+        return auction.end.then(() => {
+          expect(auctionManager.getNoBids().length).to.eql(1);
+          clock.tick(10 * 10000);
+          expect(auctionManager.getNoBids().length).to.eql(0);
+        })
+      });
+    });
+
+    describe('stale bids', () => {
+      let clock, auction;
+      beforeEach(() => {
+        clock = sinon.useFakeTimers();
+        auction = auctionManager.createAuction({adUnits});
+        indexAuctions.push(auction);
+      });
+      afterEach(() => {
+        clock.restore();
+        config.resetConfig();
+      });
+
+      it('are dropped after they expire', () => {
         bids = [
           {
+            adId: '1',
             adUnitCode: ADUNIT_CODE,
             adUnitId: ADUNIT_CODE,
             ttl: 10
           }, {
+            adId: '2',
             adUnitCode: ADUNIT_CODE,
             adUnitId: ADUNIT_CODE,
             ttl: 100
@@ -869,49 +893,13 @@ describe('auctionmanager.js', function () {
         ];
         auction.callBids();
         return auction.end.then(() => {
-          clock.tick(50 * 1000);
-          expect(auctionManager.getBidsReceived().length).to.equal(2);
-          clock.tick(56 * 1000);
+          clock.tick(10 * 1000);
+          expect(auctionManager.getBidsReceived().length).to.equal(1);
+          clock.tick(90 * 1000);
           expect(auctionManager.getBidsReceived()).to.eql([]);
         });
       });
-
-      it('are dropped after `minBidCacheTTL` seconds if they had no bid', () => {
-        auction.callBids();
-        config.setConfig({
-          minBidCacheTTL: 2
-        });
-        return auction.end.then(() => {
-          expect(auctionManager.getNoBids().length).to.eql(1);
-          clock.tick(10 * 10000);
-          expect(auctionManager.getNoBids().length).to.eql(0);
-        })
-      });
-
-      Object.entries({
-        'bids': {
-          bd: [{
-            adUnitCode: ADUNIT_CODE,
-            adUnitId: ADUNIT_CODE,
-            ttl: 10
-          }],
-          entries: () => auctionManager.getBidsReceived()
-        },
-        'no bids': {
-          bd: [],
-          entries: () => auctionManager.getNoBids()
-        }
-      }).forEach(([t, {bd, entries}]) => {
-        it(`with ${t} are never dropped if minBidCacheTTL is not set`, () => {
-          bids = bd;
-          auction.callBids();
-          return auction.end.then(() => {
-            clock.tick(100 * 1000);
-            expect(entries().length > 0).to.be.true;
-          })
-        })
-      });
-    })
+    });
   });
 
   describe('addBidResponse #1', function () {