diff --git a/modules/rubiconBidAdapter.js b/modules/rubiconBidAdapter.js
index 5c7a3dbd05c..48fe18677e0 100644
--- a/modules/rubiconBidAdapter.js
+++ b/modules/rubiconBidAdapter.js
@@ -118,6 +118,7 @@ export const spec = {
           resolution: _getScreenResolution(),
           account_id: params.accountId,
           integration: INTEGRATION,
+          'x_source.tid': bidRequest.transactionId,
           timeout: bidderRequest.timeout - (Date.now() - bidderRequest.auctionStart + TIMEOUT_BUFFER),
           stash_creatives: true,
           ae_pass_through_parameters: params.video.aeParams,
@@ -192,7 +193,7 @@ export const spec = {
         'rp_floor', floor,
         'rp_secure', isSecure() ? '1' : '0',
         'tk_flint', INTEGRATION,
-        'tid', bidRequest.transactionId,
+        'x_source.tid', bidRequest.transactionId,
         'p_screen_res', _getScreenResolution(),
         'kw', keywords,
         'tk_user_key', userId
diff --git a/test/spec/modules/rubiconBidAdapter_spec.js b/test/spec/modules/rubiconBidAdapter_spec.js
index 52a87f6397f..49c0dd9011e 100644
--- a/test/spec/modules/rubiconBidAdapter_spec.js
+++ b/test/spec/modules/rubiconBidAdapter_spec.js
@@ -145,7 +145,7 @@ describe('the rubicon adapter', () => {
             'rp_secure': /[01]/,
             'rand': '0.1',
             'tk_flint': INTEGRATION,
-            'tid': 'd45dd707-a418-42ec-b8a7-b70a6c6fab0b',
+            'x_source.tid': 'd45dd707-a418-42ec-b8a7-b70a6c6fab0b',
             'p_screen_res': /\d+x\d+/,
             'tk_user_key': '12346',
             'kw': 'a,b,c',
@@ -451,6 +451,7 @@ describe('the rubicon adapter', () => {
           expect(post.resolution).to.match(/\d+x\d+/);
           expect(post.account_id).to.equal('14062');
           expect(post.integration).to.equal(INTEGRATION);
+          expect(post['x_source.tid']).to.equal('d45dd707-a418-42ec-b8a7-b70a6c6fab0b');
           expect(post).to.have.property('timeout').that.is.a('number');
           expect(post.timeout < 5000).to.equal(true);
           expect(post.stash_creatives).to.equal(true);