diff --git a/modules/rubiconBidAdapter.js b/modules/rubiconBidAdapter.js
index 6cce22b903e..de6ddf0618c 100644
--- a/modules/rubiconBidAdapter.js
+++ b/modules/rubiconBidAdapter.js
@@ -409,6 +409,7 @@ export const spec = {
         'l_pb_bid_id',
         'p_screen_res',
         'o_ae',
+        'o_cdep',
         'rp_floor',
         'rp_secure',
         'tk_user_key'
@@ -482,6 +483,7 @@ export const spec = {
       'x_source.tid': bidderRequest.ortb2?.source?.tid,
       'x_imp.ext.tid': bidRequest.ortb2Imp?.ext?.tid,
       'l_pb_bid_id': bidRequest.bidId,
+      'o_cdep': bidRequest.ortb2?.device?.ext?.cdep,
       'p_screen_res': _getScreenResolution(),
       'tk_user_key': params.userId,
       'p_geo.latitude': isNaN(parseFloat(latitude)) ? undefined : parseFloat(latitude).toFixed(4),
diff --git a/test/spec/modules/rubiconBidAdapter_spec.js b/test/spec/modules/rubiconBidAdapter_spec.js
index 9b37fe36c77..c0bc35d161e 100644
--- a/test/spec/modules/rubiconBidAdapter_spec.js
+++ b/test/spec/modules/rubiconBidAdapter_spec.js
@@ -696,6 +696,16 @@ describe('the rubicon adapter', function () {
           expect(data['p_pos']).to.equal('atf;;btf;;');
         });
 
+        it('should correctly send cdep signal when requested', () => {
+          var badposRequest = utils.deepClone(bidderRequest);
+          badposRequest.bids[0].ortb2 = {device: {ext: {cdep: 3}}};
+
+          let [request] = spec.buildRequests(badposRequest.bids, badposRequest);
+          let data = parseQuery(request.data);
+
+          expect(data['o_cdep']).to.equal('3');
+        });
+
         it('ad engine query params should be ordered correctly', function () {
           sandbox.stub(Math, 'random').callsFake(() => 0.1);
           let [request] = spec.buildRequests(bidderRequest.bids, bidderRequest);