diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 4ac1bccaeda..1d177464b9f 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -523,6 +523,14 @@ const OPEN_RTB_PROTOCOL = {
       request.ext.prebid = Object.assign(request.ext.prebid, _s2sConfig.extPrebid);
     }
 
+    /**
+     * @type {(string[]|undefined)} - OpenRTB property 'cur', currencies available for bids
+     */
+    const adServerCur = config.getConfig('currency.adServerCurrency');
+    if (Array.isArray(adServerCur) && adServerCur.length) {
+      request.cur = adServerCur.slice();
+    }
+
     _appendSiteAppDevice(request);
 
     const digiTrust = _getDigiTrustQueryParams(bidRequests && bidRequests[0]);
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index e2a3a5b111a..61db09b6451 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -831,7 +831,36 @@ describe('S2S Adapter', function () {
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'adserver.org')[0].uids[0].id).is.equal('abc123');
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'pubcommon')).is.not.empty; ;
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'pubcommon')[0].uids[0].id).is.equal('1234');
-    })
+    });
+
+    it('setting currency.adServerCurrency results in the openRTB JSON containing cur: ["AAA"]', function () {
+      let ortb2Config = utils.deepClone(CONFIG);
+      ortb2Config.endpoint = 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction';
+      config.setConfig({
+        currency: {adServerCurrency: ['USD', 'GB', 'UK', 'AU']},
+        s2sConfig: ortb2Config
+      });
+
+      const userIdBidRequest = utils.deepClone(BID_REQUESTS);
+      adapter.callBids(REQUEST, userIdBidRequest, addBidResponse, done, ajax);
+
+      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      expect(parsedRequestBody.cur).to.deep.equal(['USD', 'GB', 'UK', 'AU']);
+    });
+
+    it('when currency.adServerCurrency is unset, the OpenRTB JSON should not contain cur', function () {
+      let ortb2Config = utils.deepClone(CONFIG);
+      ortb2Config.endpoint = 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction';
+      config.setConfig({
+        s2sConfig: ortb2Config
+      });
+
+      const userIdBidRequest = utils.deepClone(BID_REQUESTS);
+      adapter.callBids(REQUEST, userIdBidRequest, addBidResponse, done, ajax);
+
+      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      expect(typeof parsedRequestBody.cur).to.equal('undefined');
+    });
 
     it('always add ext.prebid.targeting.includebidderkeys: false for ORTB', function () {
       const s2sConfig = Object.assign({}, CONFIG, {