diff --git a/modules/nextMillenniumBidAdapter.js b/modules/nextMillenniumBidAdapter.js
index a800500faf0..4791740bf2f 100644
--- a/modules/nextMillenniumBidAdapter.js
+++ b/modules/nextMillenniumBidAdapter.js
@@ -25,12 +25,14 @@ export const spec = {
       window.nmmRefreshCounts[bid.adUnitCode] = window.nmmRefreshCounts[bid.adUnitCode] || 0;
       const postBody = {
         'id': bid.auctionId,
-        'refresh_count': window.nmmRefreshCounts[bid.adUnitCode]++,
         'ext': {
           'prebid': {
             'storedrequest': {
               'id': getBidIdParameter('placement_id', bid.params)
             }
+          },
+          'nextMillennium': {
+            'refresh_count': window.nmmRefreshCounts[bid.adUnitCode]++,
           }
         }
       }
diff --git a/test/spec/modules/nextMillenniumBidAdapter_spec.js b/test/spec/modules/nextMillenniumBidAdapter_spec.js
index d95ca1bf173..0dfee96d0ea 100644
--- a/test/spec/modules/nextMillenniumBidAdapter_spec.js
+++ b/test/spec/modules/nextMillenniumBidAdapter_spec.js
@@ -40,7 +40,7 @@ describe('nextMillenniumBidAdapterTests', function() {
 
   it('Check if refresh_count param is incremented', function() {
     const request = spec.buildRequests(bidRequestData);
-    expect(JSON.parse(request[0].data).refresh_count).to.equal(3);
+    expect(JSON.parse(request[0].data).ext.nextMillennium.refresh_count).to.equal(3);
   });
 
   it('Test getUserSyncs function', function () {