diff --git a/modules/quantcastBidAdapter.js b/modules/quantcastBidAdapter.js
index e6f4d27bdbb..3b06e2d61c1 100644
--- a/modules/quantcastBidAdapter.js
+++ b/modules/quantcastBidAdapter.js
@@ -69,7 +69,7 @@ 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 = {
@@ -92,7 +92,8 @@ export const spec = {
         },
         bidId: bid.bidId,
         gdprSignal: gdprConsent.gdprApplies ? 1 : 0,
-        gdprConsent: gdprConsent.consentString
+        gdprConsent: gdprConsent.consentString,
+        prebidJsVersion: '$prebid.version$'
       };
 
       const data = JSON.stringify(requestData);
diff --git a/test/spec/modules/quantcastBidAdapter_spec.js b/test/spec/modules/quantcastBidAdapter_spec.js
index f5a7602c7ab..e6b219bcbcc 100644
--- a/test/spec/modules/quantcastBidAdapter_spec.js
+++ b/test/spec/modules/quantcastBidAdapter_spec.js
@@ -119,7 +119,8 @@ describe('Quantcast adapter', function () {
           domain
         },
         bidId: '2f7b179d443f14',
-        gdprSignal: 0
+        gdprSignal: 0,
+        prebidJsVersion: '$prebid.version$'
       };
 
       expect(requests[0].data).to.equal(JSON.stringify(expectedBidRequest));