diff --git a/modules/adheseBidAdapter.js b/modules/adheseBidAdapter.js
index daea17a2a5b..6ca8c8a6aa6 100644
--- a/modules/adheseBidAdapter.js
+++ b/modules/adheseBidAdapter.js
@@ -18,13 +18,15 @@ export const spec = {
     if (validBidRequests.length === 0) {
       return null;
     }
+    const { gdprConsent, refererInfo } = bidderRequest;
 
     const account = getAccount(validBidRequests);
     const targets = validBidRequests.map(bid => bid.params.data).reduce(mergeTargets, {});
-    const gdprParams = (bidderRequest.gdprConsent && bidderRequest.gdprConsent.consentString) ? [ 'xt' + bidderRequest.gdprConsent.consentString ] : [];
+    const gdprParams = (gdprConsent && gdprConsent.consentString) ? [`xt${gdprConsent.consentString}`] : [];
+    const refererParams = (refererInfo && refererInfo.referer) ? [`xf${base64urlEncode(refererInfo.referer)}`] : [];
     const targetsParams = Object.keys(targets).map(targetCode => targetCode + targets[targetCode].join(';'));
     const slotsParams = validBidRequests.map(bid => 'sl' + bidToSlotName(bid));
-    const params = [...slotsParams, ...targetsParams, ...gdprParams].map(s => '/' + s).join('');
+    const params = [...slotsParams, ...targetsParams, ...gdprParams, ...refererParams].map(s => `/${s}`).join('');
     const cacheBuster = '?t=' + new Date().getTime();
     const uri = 'https://ads-' + account + '.adhese.com/json' + params + cacheBuster;
 
@@ -166,4 +168,8 @@ function getAdDetails(ad) {
   return { creativeId: creativeId, dealId: dealId };
 }
 
+function base64urlEncode(s) {
+  return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+}
+
 registerBidder(spec);
diff --git a/test/spec/modules/adheseBidAdapter_spec.js b/test/spec/modules/adheseBidAdapter_spec.js
index 68beedd4b35..348fb772319 100644
--- a/test/spec/modules/adheseBidAdapter_spec.js
+++ b/test/spec/modules/adheseBidAdapter_spec.js
@@ -64,6 +64,9 @@ describe('AdheseAdapter', function () {
       gdprConsent: {
         gdprApplies: true,
         consentString: 'CONSENT_STRING'
+      },
+      refererInfo: {
+        referer: 'http://prebid.org/dev-docs/subjects?_d=1'
       }
     };
 
@@ -91,6 +94,12 @@ describe('AdheseAdapter', function () {
       expect(req.url).to.contain('/xtCONSENT_STRING');
     });
 
+    it('should include referer param in base64url format', function () {
+      let req = spec.buildRequests([ minimalBid() ], bidderRequest);
+
+      expect(req.url).to.contain('/xfaHR0cDovL3ByZWJpZC5vcmcvZGV2LWRvY3Mvc3ViamVjdHM_X2Q9MQ');
+    });
+
     it('should include bids', function () {
       let bid = minimalBid();
       let req = spec.buildRequests([ bid ], bidderRequest);