diff --git a/modules/quantumBidAdapter.js b/modules/quantumBidAdapter.js
index 242ccc63204..f6df8a2ff61 100644
--- a/modules/quantumBidAdapter.js
+++ b/modules/quantumBidAdapter.js
@@ -99,12 +99,15 @@ export const spec = {
       if (serverBody.cobj) {
         bid.cobj = serverBody.cobj;
       }
+      if (bidRequest.sizes) {
+        bid.width = bidRequest.sizes[0][0];
+        bid.height = bidRequest.sizes[0][1];
+      }
 
       bid.nurl = serverBody.nurl;
       bid.sync = serverBody.sync;
       if (bidRequest.renderMode && bidRequest.renderMode === 'banner') {
-        bid.width = 300;
-        bid.height = 225;
+        bid.mediaType = 'banner';
         if (serverBody.native) {
           const adAssetsUrl = '//cdn.elasticad.net/native/serve/js/quantx/quantumAd/';
           let assets = serverBody.native.assets;
@@ -216,6 +219,7 @@ export const spec = {
         }
       } else {
         // native
+        bid.mediaType = 'native';
         if (bidRequest.mediaType === 'native') {
           if (serverBody.native) {
             let assets = serverBody.native.assets;
diff --git a/test/spec/modules/quantumBidAdapter_spec.js b/test/spec/modules/quantumBidAdapter_spec.js
index 2db1c0b0fbd..053ec98ffaa 100644
--- a/test/spec/modules/quantumBidAdapter_spec.js
+++ b/test/spec/modules/quantumBidAdapter_spec.js
@@ -5,7 +5,7 @@ import { newBidder } from 'src/adapters/bidderFactory'
 const ENDPOINT = '//s.sspqns.com/hb'
 const REQUEST = {
   'bidder': 'quantum',
-  'sizes': [[300, 225]],
+  'sizes': [[300, 250]],
   'renderMode': 'banner',
   'params': {
     placementId: 21546
@@ -245,6 +245,7 @@ describe('quantumBidAdapter', () => {
       expect(result[0]).to.have.property('cpm').equal(0.3)
       expect(result[0]).to.have.property('width').to.be.below(2)
       expect(result[0]).to.have.property('height').to.be.below(2)
+      expect(result[0]).to.have.property('mediaType').equal('native')
       expect(result[0]).to.have.property('native')
     })
 
@@ -252,8 +253,8 @@ describe('quantumBidAdapter', () => {
       const result = spec.interpretResponse({body: serverResponse}, REQUEST)
       expect(result[0]).to.have.property('cpm').equal(0.3)
       expect(result[0]).to.have.property('width').equal(300)
-      expect(result[0]).to.have.property('height').equal(225)
-      // expect(result[0]).to.have.property('native');
+      expect(result[0]).to.have.property('height').equal(250)
+      expect(result[0]).to.have.property('mediaType').equal('banner')
       expect(result[0]).to.have.property('ad')
     })