diff --git a/modules/smaatoBidAdapter.js b/modules/smaatoBidAdapter.js
index dd389b42098..63fdeb2fcef 100644
--- a/modules/smaatoBidAdapter.js
+++ b/modules/smaatoBidAdapter.js
@@ -5,7 +5,7 @@ import {ADPOD, BANNER, VIDEO} from '../src/mediaTypes.js';
 
 const BIDDER_CODE = 'smaato';
 const SMAATO_ENDPOINT = 'https://prebid.ad.smaato.net/oapi/prebid';
-const SMAATO_CLIENT = 'prebid_js_$prebid.version$_1.4'
+const SMAATO_CLIENT = 'prebid_js_$prebid.version$_1.5'
 const CURRENCY = 'USD';
 
 const buildOpenRtbBidRequest = (bidRequest, bidderRequest) => {
@@ -37,6 +37,11 @@ const buildOpenRtbBidRequest = (bidRequest, bidderRequest) => {
     user: {
       ext: {}
     },
+    source: {
+      ext: {
+        schain: bidRequest.schain
+      }
+    },
     ext: {
       client: SMAATO_CLIENT
     }
diff --git a/test/spec/modules/smaatoBidAdapter_spec.js b/test/spec/modules/smaatoBidAdapter_spec.js
index faa288306a5..801aef514fc 100644
--- a/test/spec/modules/smaatoBidAdapter_spec.js
+++ b/test/spec/modules/smaatoBidAdapter_spec.js
@@ -287,6 +287,13 @@ describe('smaatoBidAdapterTest', () => {
         expect(req.regs.ext.us_privacy).to.equal('uspConsentString');
       });
 
+      it('sends no schain if no schain exists', () => {
+        const reqs = spec.buildRequests([singleBannerBidRequest], defaultBidderRequest);
+
+        const req = extractPayloadOfFirstAndOnlyRequest(reqs);
+        expect(req.source.ext.schain).to.not.exist;
+      });
+
       it('sends tmax', () => {
         const reqs = spec.buildRequests([singleBannerBidRequest], defaultBidderRequest);
 
@@ -854,6 +861,29 @@ describe('smaatoBidAdapterTest', () => {
         expect(req.user.ext.eids).to.have.length(2);
       });
     });
+
+    describe('schain in request', () => {
+      it('schain is added to source.ext.schain', () => {
+        const schain = {
+          ver: '1.0',
+          complete: 1,
+          nodes: [
+            {
+              'asi': 'asi',
+              'sid': 'sid',
+              'rid': 'rid',
+              'hp': 1
+            }
+          ]
+        };
+        const bidRequestWithSchain = Object.assign({}, singleBannerBidRequest, {schain: schain});
+
+        const reqs = spec.buildRequests([bidRequestWithSchain], defaultBidderRequest);
+
+        const req = extractPayloadOfFirstAndOnlyRequest(reqs);
+        expect(req.source.ext.schain).to.deep.equal(schain);
+      });
+    });
   });
 
   describe('interpretResponse', () => {