diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 909dc1d42fb..99922bb9681 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -714,7 +714,7 @@ Object.assign(ORTB2.prototype, {
         return acc;
       }, {...deepAccess(adUnit, 'ortb2Imp.ext')});
 
-      const imp = { id: impressionId, ext, secure: s2sConfig.secure };
+      const imp = { ...adUnit.ortb2Imp, id: impressionId, ext, secure: s2sConfig.secure };
 
       const ortb2 = {...deepAccess(adUnit, 'ortb2Imp.ext.data')};
       Object.keys(ortb2).forEach(prop => {
@@ -745,7 +745,7 @@ Object.assign(ORTB2.prototype, {
         }
       });
 
-      Object.assign(imp, mediaTypes);
+      mergeDeep(imp, mediaTypes);
 
       // if storedAuctionResponse has been set, pass SRID
       const storedAuctionResponseBid = find(firstBidRequest.bids, bid => (bid.adUnitCode === adUnit.code && bid.storedAuctionResponse));
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index 0d62f458969..aa9c229203b 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -2910,6 +2910,24 @@ describe('S2S Adapter', function () {
       expect(requestBid.coopSync).to.be.undefined;
     });
 
+    it('should set imp banner if ortb2Imp.banner is present', function() {
+      const consentConfig = { s2sConfig: CONFIG };
+      config.setConfig(consentConfig);
+      const bidRequest = utils.deepClone(REQUEST);
+      bidRequest.ad_units[0].ortb2Imp = {
+        banner: {
+          api: 7
+        },
+        instl: 1
+      };
+
+      adapter.callBids(bidRequest, BID_REQUESTS, addBidResponse, done, ajax);
+      const parsedRequestBody = JSON.parse(server.requests[0].requestBody);
+
+      expect(parsedRequestBody.imp[0].banner.api).to.equal(7);
+      expect(parsedRequestBody.imp[0].instl).to.equal(1);
+    });
+
     it('adds debug flag', function () {
       config.setConfig({debug: true});