diff --git a/modules/rubiconBidAdapter.js b/modules/rubiconBidAdapter.js
index d314864d0d9..625d34b0648 100644
--- a/modules/rubiconBidAdapter.js
+++ b/modules/rubiconBidAdapter.js
@@ -138,7 +138,7 @@ export const spec = {
         let slotData = {
           site_id: params.siteId,
           zone_id: params.zoneId,
-          position: params.position || 'unknown',
+          position: parsePosition(params.position),
           floor: parseFloat(params.floor) > 0.01 ? params.floor : 0.01,
           element_id: bidRequest.adUnitCode,
           name: bidRequest.adUnitCode,
@@ -393,6 +393,13 @@ function mapSizes(sizes) {
     }, []);
 }
 
+function parsePosition(position) {
+  if (position === 'atf' || position === 'btf') {
+    return position;
+  }
+  return 'unknown';
+}
+
 export function masSizeOrdering(sizes) {
   const MAS_SIZE_PRIORITY = [15, 2, 9];
 
diff --git a/test/spec/modules/rubiconBidAdapter_spec.js b/test/spec/modules/rubiconBidAdapter_spec.js
index 6e27bdb87d8..1c4bccc69c5 100644
--- a/test/spec/modules/rubiconBidAdapter_spec.js
+++ b/test/spec/modules/rubiconBidAdapter_spec.js
@@ -512,6 +512,50 @@ describe('the rubicon adapter', () => {
           expect(slot.visitor).to.have.property('lastsearch').that.equals('iphone');
         });
 
+        it('should send request with proper ad position', () => {
+          createVideoBidderRequest();
+          var positionBidderRequest = clone(bidderRequest);
+          positionBidderRequest.bids[0].params.position = 'atf';
+          let [request] = spec.buildRequests(positionBidderRequest.bids, positionBidderRequest);
+          let post = request.data;
+          let slot = post.slots[0];
+
+          expect(slot.position).to.equal('atf');
+
+          positionBidderRequest = clone(bidderRequest);
+          positionBidderRequest.bids[0].params.position = 'btf';
+          [request] = spec.buildRequests(positionBidderRequest.bids, positionBidderRequest);
+          post = request.data;
+          slot = post.slots[0];
+
+          expect(slot.position).to.equal('btf');
+
+          positionBidderRequest = clone(bidderRequest);
+          positionBidderRequest.bids[0].params.position = 'unknown';
+          [request] = spec.buildRequests(positionBidderRequest.bids, positionBidderRequest);
+          post = request.data;
+          slot = post.slots[0];
+
+          expect(slot.position).to.equal('unknown');
+
+          positionBidderRequest = clone(bidderRequest);
+          positionBidderRequest.bids[0].params.position = '123';
+          [request] = spec.buildRequests(positionBidderRequest.bids, positionBidderRequest);
+          post = request.data;
+          slot = post.slots[0];
+
+          expect(slot.position).to.equal('unknown');
+
+          positionBidderRequest = clone(bidderRequest);
+          delete positionBidderRequest.bids[0].params.position;
+          expect(positionBidderRequest.bids[0].params.position).to.equal(undefined);
+          [request] = spec.buildRequests(positionBidderRequest.bids, positionBidderRequest);
+          post = request.data;
+          slot = post.slots[0];
+
+          expect(slot.position).to.equal('unknown');
+        });
+
         it('should allow a floor price override', () => {
           createVideoBidderRequest();