diff --git a/modules/33acrossIdSystem.js b/modules/33acrossIdSystem.js
index 3763fee5124..5e07fe9523d 100644
--- a/modules/33acrossIdSystem.js
+++ b/modules/33acrossIdSystem.js
@@ -13,6 +13,7 @@ import { uspDataHandler } from '../src/adapterManager.js';
 const MODULE_NAME = '33acrossId';
 const API_URL = 'https://lexicon.33across.com/v1/envelope';
 const AJAX_TIMEOUT = 10000;
+const CALLER_NAME = 'pbjs';
 
 function getEnvelope(response) {
   if (!response.succeeded) {
@@ -36,6 +37,8 @@ function calculateQueryStringParams(pid, gdprConsentData) {
   const params = {
     pid,
     gdpr: Number(gdprApplies),
+    src: CALLER_NAME,
+    ver: '$prebid.version$'
   };
 
   if (uspString) {
diff --git a/test/spec/modules/33acrossIdSystem_spec.js b/test/spec/modules/33acrossIdSystem_spec.js
index 8198bd75381..765b320f925 100644
--- a/test/spec/modules/33acrossIdSystem_spec.js
+++ b/test/spec/modules/33acrossIdSystem_spec.js
@@ -43,7 +43,10 @@ describe('33acrossIdSystem', () => {
 
       expect(request.method).to.equal('GET');
       expect(request.withCredentials).to.be.true;
-      expect(request.url).to.contain('https://lexicon.33across.com/v1/envelope?pid=12345');
+
+      const regExp = new RegExp('https://lexicon.33across.com/v1/envelope\\?pid=12345&gdpr=\\d&src=pbjs&ver=$prebid.version$');
+
+      expect(request.url).to.match(regExp);
       expect(completeCallback.calledOnceWithExactly('foo')).to.be.true;
     });