diff --git a/modules/ceeIdSystem.js b/modules/ceeIdSystem.js
index d1534ddada2..30240e3f75f 100644
--- a/modules/ceeIdSystem.js
+++ b/modules/ceeIdSystem.js
@@ -43,7 +43,7 @@ export const ceeIdSubmodule = {
    * performs action to obtain id and return a value
    * @function
    * @returns {(IdResponse|undefined)}
-  */
+   */
   getId(config) {
     const { params = {} } = config;
     const { tokenName, value } = params
diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 168758763e8..0ecb6365430 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -550,6 +550,7 @@ export const processPBSRequest = hook('sync', function (s2sBidRequest, bidReques
   const requestJson = request && JSON.stringify(request);
   logInfo('BidRequest: ' + requestJson);
   const endpointUrl = getMatchingConsentUrl(s2sBidRequest.s2sConfig.endpoint, gdprConsent);
+  const customHeaders = deepAccess(s2sBidRequest, 's2sConfig.customHeaders', {});
   if (request && requestJson && endpointUrl) {
     const networkDone = s2sBidRequest.metrics.startTiming('net');
     ajax(
@@ -584,7 +585,8 @@ export const processPBSRequest = hook('sync', function (s2sBidRequest, bidReques
       {
         contentType: 'text/plain',
         withCredentials: true,
-        browsingTopics: isActivityAllowed(ACTIVITY_TRANSMIT_UFPD, s2sActivityParams(s2sBidRequest.s2sConfig))
+        browsingTopics: isActivityAllowed(ACTIVITY_TRANSMIT_UFPD, s2sActivityParams(s2sBidRequest.s2sConfig)),
+        customHeaders
       }
     );
   } else {
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index 2b4cd025515..d44a67d2acc 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -825,6 +825,20 @@ describe('S2S Adapter', function () {
         })
       })
     })
+    
+    it('should set customHeaders correctly when publisher has provided it', () => {
+      let configWithCustomHeaders = utils.deepClone(CONFIG);
+      configWithCustomHeaders.customHeaders = { customHeader1: 'customHeader1Value' };
+      config.setConfig({ s2sConfig: configWithCustomHeaders });
+
+      let reqWithNewConfig = utils.deepClone(REQUEST);
+      reqWithNewConfig.s2sConfig = configWithCustomHeaders;
+
+      adapter.callBids(reqWithNewConfig, BID_REQUESTS, addBidResponse, done, ajax);
+      const reqHeaders = server.requests[0].requestHeaders
+      expect(reqHeaders.customHeader1).to.exist;
+      expect(reqHeaders.customHeader1).to.equal('customHeader1Value');
+    });
 
     it('should block request if config did not define p1Consent URL in endpoint object config', function () {
       let badConfig = utils.deepClone(CONFIG);