diff --git a/modules/colossussspBidAdapter.js b/modules/colossussspBidAdapter.js
index 9a0ff3a5422..c1560680a6e 100644
--- a/modules/colossussspBidAdapter.js
+++ b/modules/colossussspBidAdapter.js
@@ -97,7 +97,7 @@ export const spec = {
       secure: location.protocol === 'https:' ? 1 : 0,
       host: location.host,
       page: location.pathname,
-      placements: placements,
+      placements: placements
     };
 
     if (bidderRequest) {
@@ -117,6 +117,7 @@ export const spec = {
         placementId: bid.params.placement_id,
         groupId: bid.params.group_id,
         bidId: bid.bidId,
+        tid: bid.transactionId,
         eids: [],
         floor: {}
       };
diff --git a/test/spec/modules/colossussspBidAdapter_spec.js b/test/spec/modules/colossussspBidAdapter_spec.js
index f32a0bf4ebe..8b06868390a 100644
--- a/test/spec/modules/colossussspBidAdapter_spec.js
+++ b/test/spec/modules/colossussspBidAdapter_spec.js
@@ -101,7 +101,7 @@ 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', 'groupId', 'eids', 'bidId', 'traffic', 'sizes', 'schain', 'floor', 'gpid');
+        expect(placement).to.have.all.keys('placementId', 'groupId', 'eids', 'bidId', 'traffic', 'sizes', 'schain', 'floor', 'gpid', 'tid');
         expect(placement.schain).to.be.an('object')
         expect(placement.placementId).to.be.a('number');
         expect(placement.groupId).to.be.a('number');
@@ -110,6 +110,7 @@ describe('ColossussspAdapter', function () {
         expect(placement.sizes).to.be.an('array');
         expect(placement.floor).to.be.an('object');
         expect(placement.gpid).to.be.an('string');
+        expect(placement.tid).to.be.an('string');
       }
     });
 
@@ -143,7 +144,7 @@ describe('ColossussspAdapter', function () {
         let placement = placements[i];
         expect(placement).to.have.all.keys('placementId', 'groupId', 'eids', 'bidId', 'traffic', 'schain', 'floor', 'gpid', 'sizes',
           'playerSize', 'minduration', 'maxduration', 'mimes', 'protocols', 'startdelay', 'placement', 'skip', 'skipafter',
-          'minbitrate', 'maxbitrate', 'delivery', 'playbackmethod', 'api', 'linearity'
+          'minbitrate', 'maxbitrate', 'delivery', 'playbackmethod', 'api', 'linearity', 'tid'
         );
         expect(placement.schain).to.be.an('object')
         expect(placement.placementId).to.be.a('number');
@@ -155,6 +156,7 @@ describe('ColossussspAdapter', function () {
         expect(placement.playerSize).to.be.an('array');
         expect(placement.minduration).to.be.an('number');
         expect(placement.maxduration).to.be.an('number');
+        expect(placement.tid).to.be.an('string');
       }
     });