diff --git a/modules/quantcastBidAdapter.js b/modules/quantcastBidAdapter.js
index e6f4d27bdbb..79128a834a4 100644
--- a/modules/quantcastBidAdapter.js
+++ b/modules/quantcastBidAdapter.js
@@ -1,4 +1,5 @@
 import * as utils from 'src/utils';
+import { ajax } from 'src/ajax';
 import { registerBidder } from 'src/adapters/bidderFactory';
 
 const BIDDER_CODE = 'quantcast';
@@ -69,7 +70,7 @@ export const spec = {
         });
       });
 
-      const gdprConsent = bidderRequest ? bidderRequest.gdprConsent : {};
+      const gdprConsent = (bidderRequest && bidderRequest.gdprConsent) ? bidderRequest.gdprConsent : {};
 
       // Request Data Format can be found at https://wiki.corp.qc/display/adinf/QCX
       const requestData = {
@@ -157,6 +158,10 @@ export const spec = {
     });
 
     return bidResponsesList;
+  },
+  onTimeout(timeoutData) {
+    const url = `${QUANTCAST_PROTOCOL}://${QUANTCAST_DOMAIN}:${QUANTCAST_PORT}/qchb_notify?type=timeout`;
+    ajax(url, null, null);
   }
 };
 
diff --git a/test/spec/modules/quantcastBidAdapter_spec.js b/test/spec/modules/quantcastBidAdapter_spec.js
index f5a7602c7ab..e64294e87e2 100644
--- a/test/spec/modules/quantcastBidAdapter_spec.js
+++ b/test/spec/modules/quantcastBidAdapter_spec.js
@@ -1,5 +1,6 @@
 import * as utils from 'src/utils';
 import { expect } from 'chai';
+import { stub, sandbox } from 'sinon';
 import {
   QUANTCAST_DOMAIN,
   QUANTCAST_TEST_DOMAIN,
@@ -12,6 +13,7 @@ import {
 } from '../../../modules/quantcastBidAdapter';
 import { newBidder } from '../../../src/adapters/bidderFactory';
 import { parse } from 'src/url';
+import * as ajax from 'src/ajax';
 
 describe('Quantcast adapter', function () {
   const quantcastAdapter = newBidder(qcSpec);
@@ -211,4 +213,19 @@ describe('Quantcast adapter', function () {
       expect(interpretedResponse.length).to.equal(0);
     });
   });
+
+  describe('`onTimeout`', function() {
+    it('makes a request to the notify endpoint', function() {
+      const sinonSandbox = sandbox.create();
+      const ajaxStub = sinonSandbox.stub(ajax, 'ajax').callsFake(function() {});
+      const timeoutData = {
+        bidder: 'quantcast'
+      };
+      qcSpec.onTimeout(timeoutData);
+      const expectedUrl = `${QUANTCAST_PROTOCOL}://${QUANTCAST_DOMAIN}:${QUANTCAST_PORT}/qchb_notify?type=timeout`;
+      ajaxStub.withArgs(expectedUrl, null, null).calledOnce.should.be.true;
+      ajaxStub.restore();
+      sinonSandbox.restore();
+    });
+  });
 });