diff --git a/modules/colossussspBidAdapter.js b/modules/colossussspBidAdapter.js
index 14896ac9cff..b1d36d1095c 100644
--- a/modules/colossussspBidAdapter.js
+++ b/modules/colossussspBidAdapter.js
@@ -61,13 +61,13 @@ export const spec = {
     const location = winTop.location;
     let placements = [];
     let request = {
-      'deviceWidth': winTop.screen.width,
-      'deviceHeight': winTop.screen.height,
-      'language': (navigator && navigator.language) ? navigator.language : '',
-      'secure': location.protocol === 'https:' ? 1 : 0,
-      'host': location.host,
-      'page': location.pathname,
-      'placements': placements,
+      deviceWidth: winTop.screen.width,
+      deviceHeight: winTop.screen.height,
+      language: (navigator && navigator.language) ? navigator.language : '',
+      secure: location.protocol === 'https:' ? 1 : 0,
+      host: location.host,
+      page: location.pathname,
+      placements: placements,
     };
 
     if (bidderRequest) {
@@ -85,6 +85,7 @@ export const spec = {
       let traff = bid.params.traffic || BANNER
       let placement = {
         placementId: bid.params.placement_id,
+        groupId: bid.params.group_id,
         bidId: bid.bidId,
         sizes: bid.mediaTypes[traff].sizes,
         traffic: traff,
diff --git a/modules/colossussspBidAdapter.md b/modules/colossussspBidAdapter.md
index 8797c648c95..4187dfbf36e 100644
--- a/modules/colossussspBidAdapter.md
+++ b/modules/colossussspBidAdapter.md
@@ -26,5 +26,19 @@ Module that connects to Colossus SSP demand sources
                 traffic: 'banner'
             }
         }]
-    ];
+    }, {
+        code: 'placementid_1',
+        mediaTypes: {
+            banner: {
+                sizes: [[300, 250], [300,600]]
+            }
+        },
+        bids: [{
+            bidder: 'colossusssp',
+            params: {
+                group_id: 0,
+                traffic: 'banner'
+            }
+        }]
+    }];
 ```
diff --git a/test/spec/modules/colossussspBidAdapter_spec.js b/test/spec/modules/colossussspBidAdapter_spec.js
index 69afc353de7..e453bcbc997 100644
--- a/test/spec/modules/colossussspBidAdapter_spec.js
+++ b/test/spec/modules/colossussspBidAdapter_spec.js
@@ -7,7 +7,8 @@ describe('ColossussspAdapter', function () {
     bidder: 'colossusssp',
     bidderRequestId: '145e1d6a7837c9',
     params: {
-      placement_id: 0
+      placement_id: 0,
+      group_id: 0
     },
     placementCode: 'placementid_0',
     auctionId: '74f78609-a92d-4cf1-869f-1b244bbfb5d2',
@@ -95,9 +96,10 @@ describe('ColossussspAdapter', function () {
       let placements = data['placements'];
       for (let i = 0; i < placements.length; i++) {
         let placement = placements[i];
-        expect(placement).to.have.all.keys('placementId', 'eids', 'bidId', 'traffic', 'sizes', 'schain', 'floor', 'gpid');
+        expect(placement).to.have.all.keys('placementId', 'groupId', 'eids', 'bidId', 'traffic', 'sizes', 'schain', 'floor', 'gpid');
         expect(placement.schain).to.be.an('object')
         expect(placement.placementId).to.be.a('number');
+        expect(placement.groupId).to.be.a('number');
         expect(placement.bidId).to.be.a('string');
         expect(placement.traffic).to.be.a('string');
         expect(placement.sizes).to.be.an('array');