diff --git a/modules/openxoutstreamBidAdapter.js b/modules/openxoutstreamBidAdapter.js
index 6da234284c6..dde101f25d5 100644
--- a/modules/openxoutstreamBidAdapter.js
+++ b/modules/openxoutstreamBidAdapter.js
@@ -86,7 +86,9 @@ function buildCommonQueryParamsFromBids(bids, bidderRequest) {
     auid: '540141567',
     dddid: utils._map(bids, bid => bid.transactionId).join(','),
     openrtb: '%7B%22mimes%22%3A%5B%22video%2Fmp4%22%5D%7D',
-    nocache: new Date().getTime()
+    nocache: new Date().getTime(),
+    vht: bids[0].params.height || bids[0].sizes[0][1],
+    vwd: bids[0].params.width || bids[0].sizes[0][0]
   };
 
   if (utils.deepAccess(bidderRequest, 'gdprConsent')) {
diff --git a/test/spec/modules/openxoutstreamBidAdapter_spec.js b/test/spec/modules/openxoutstreamBidAdapter_spec.js
index a1d4f4aa2d4..59d56bee74b 100644
--- a/test/spec/modules/openxoutstreamBidAdapter_spec.js
+++ b/test/spec/modules/openxoutstreamBidAdapter_spec.js
@@ -99,6 +99,7 @@ describe('OpenXOutstreamAdapter', function () {
           'delDomain': 'test-del-domain'
         },
         'adUnitCode': 'adunit-code',
+        'sizes': [300, 250],
         mediaTypes: {
           banner: {
             sizes: [[300, 250], [300, 600]]