diff --git a/modules/criteoIdSystem.js b/modules/criteoIdSystem.js
index 83bc773cb30..ac26d34d529 100644
--- a/modules/criteoIdSystem.js
+++ b/modules/criteoIdSystem.js
@@ -17,19 +17,11 @@ export const storage = getStorageManager(gvlid, bidderCode);
 
 const bididStorageKey = 'cto_bidid';
 const bundleStorageKey = 'cto_bundle';
-const cookieWriteableKey = 'cto_test_cookie';
 const cookiesMaxAge = 13 * 30 * 24 * 60 * 60 * 1000;
 
 const pastDateString = new Date(0).toString();
 const expirationString = new Date(utils.timestamp() + cookiesMaxAge).toString();
 
-function areCookiesWriteable() {
-  storage.setCookie(cookieWriteableKey, '1');
-  const canWrite = storage.getCookie(cookieWriteableKey) === '1';
-  storage.setCookie(cookieWriteableKey, '', pastDateString);
-  return canWrite;
-}
-
 function extractProtocolHost (url, returnOnlyHost = false) {
   const parsedUrl = utils.parseUrl(url, {noDecodeWholeURL: true})
   return returnOnlyHost
@@ -60,20 +52,22 @@ function getCriteoDataFromAllStorages() {
   }
 }
 
-function buildCriteoUsersyncUrl(topUrl, domain, bundle, areCookiesWriteable, isPublishertagPresent, gdprString) {
+function buildCriteoUsersyncUrl(topUrl, domain, bundle, areCookiesWriteable, isLocalStorageWritable, isPublishertagPresent, gdprString) {
   const url = 'https://gum.criteo.com/sid/json?origin=prebid' +
     `${topUrl ? '&topUrl=' + encodeURIComponent(topUrl) : ''}` +
     `${domain ? '&domain=' + encodeURIComponent(domain) : ''}` +
     `${bundle ? '&bundle=' + encodeURIComponent(bundle) : ''}` +
     `${gdprString ? '&gdprString=' + encodeURIComponent(gdprString) : ''}` +
     `${areCookiesWriteable ? '&cw=1' : ''}` +
-    `${isPublishertagPresent ? '&pbt=1' : ''}`
+    `${isPublishertagPresent ? '&pbt=1' : ''}` +
+    `${isLocalStorageWritable ? '&lsw=1' : ''}`;
 
   return url;
 }
 
 function callCriteoUserSync(parsedCriteoData, gdprString) {
-  const cw = areCookiesWriteable();
+  const cw = storage.cookiesAreEnabled();
+  const lsw = storage.localStorageIsEnabled();
   const topUrl = extractProtocolHost(getRefererInfo().referer);
   const domain = extractProtocolHost(document.location.href, true);
   const isPublishertagPresent = typeof criteo_pubtag !== 'undefined'; // eslint-disable-line camelcase
@@ -83,6 +77,7 @@ function callCriteoUserSync(parsedCriteoData, gdprString) {
     domain,
     parsedCriteoData.bundle,
     cw,
+    lsw,
     isPublishertagPresent,
     gdprString
   );
diff --git a/test/spec/modules/criteoIdSystem_spec.js b/test/spec/modules/criteoIdSystem_spec.js
index aa5807da0da..65e5aaf741d 100644
--- a/test/spec/modules/criteoIdSystem_spec.js
+++ b/test/spec/modules/criteoIdSystem_spec.js
@@ -71,7 +71,6 @@ describe('CriteoId module', function () {
   });
 
   it('should call user sync url with the right params', function () {
-    getCookieStub.withArgs('cto_test_cookie').returns('1');
     getCookieStub.withArgs('cto_bundle').returns('bundle');
     window.criteo_pubtag = {}
 
@@ -80,7 +79,7 @@ describe('CriteoId module', function () {
     ajaxBuilderStub.callsFake(mockResponse(undefined, ajaxStub))
 
     criteoIdSubmodule.getId();
-    const expectedUrl = `https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Ftestdev.com%2F&domain=testdev.com&bundle=bundle&cw=1&pbt=1`;
+    const expectedUrl = `https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Ftestdev.com%2F&domain=testdev.com&bundle=bundle&cw=1&pbt=1&lsw=1`;
 
     expect(ajaxStub.calledWith(expectedUrl)).to.be.true;