diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 96986ed185c..7536851f5e1 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -71,6 +71,7 @@ config.setDefaults({
  * @property {string} endpoint endpoint to contact
  *  === optional params below ===
  * @property {number} [timeout] timeout for S2S bidders - should be lower than `pbjs.requestBids({timeout})`
+ * @property {number} [defaultTtl] ttl for S2S bidders when pbs does not return a ttl on the response - defaults to 60`
  * @property {boolean} [cacheMarkup] whether to cache the adm result
  * @property {string} [adapter] adapter code to use for S2S
  * @property {string} [syncEndpoint] endpoint URL for syncing cookies
@@ -832,7 +833,8 @@ const OPEN_RTB_PROTOCOL = {
           bidObject.currency = (response.cur) ? response.cur : DEFAULT_S2S_CURRENCY;
 
           // TODO: Remove when prebid-server returns ttl and netRevenue
-          bidObject.ttl = (bid.ttl) ? bid.ttl : DEFAULT_S2S_TTL;
+          const configTtl = _s2sConfig.defaultTtl || DEFAULT_S2S_TTL;
+          bidObject.ttl = (bid.ttl) ? bid.ttl : configTtl;
           bidObject.netRevenue = (bid.netRevenue) ? bid.netRevenue : DEFAULT_S2S_NETREVENUE;
 
           bids.push({ adUnit: bid.impid, bid: bidObject });
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index b4544a2ec48..d99ec9d421d 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -1702,6 +1702,24 @@ describe('S2S Adapter', function () {
       expect(response).to.have.property('cpm', 0.5);
       expect(response).to.not.have.property('vastUrl');
       expect(response).to.not.have.property('videoCacheKey');
+      expect(response).to.have.property('ttl', 60);
+    });
+
+    it('respects defaultTtl', function () {
+      const s2sConfig = Object.assign({}, CONFIG, {
+        endpoint: 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction',
+        defaultTtl: 30
+      });
+      config.setConfig({ s2sConfig });
+
+      adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
+      server.requests[0].respond(200, {}, JSON.stringify(RESPONSE_OPENRTB));
+
+      sinon.assert.calledOnce(events.emit);
+      const event = events.emit.firstCall.args;
+      sinon.assert.calledOnce(addBidResponse);
+      const response = addBidResponse.firstCall.args[1];
+      expect(response).to.have.property('ttl', 30);
     });
 
     it('handles OpenRTB video responses', function () {
@@ -2155,6 +2173,15 @@ describe('S2S Adapter', function () {
       })
     });
 
+    it('should set default s2s ttl', function () {
+      config.setConfig({
+        s2sConfig: {
+          defaultTtl: 30
+        }
+      });
+      expect(config.getConfig('s2sConfig').defaultTtl).to.deep.equal(30);
+    });
+
     it('should set syncUrlModifier', function () {
       config.setConfig({
         s2sConfig: {