diff --git a/modules/rubiconBidAdapter.js b/modules/rubiconBidAdapter.js
index 7885158425b..d07b6731cda 100644
--- a/modules/rubiconBidAdapter.js
+++ b/modules/rubiconBidAdapter.js
@@ -5,13 +5,9 @@ import {BANNER, VIDEO} from '../src/mediaTypes';
 
 const DEFAULT_INTEGRATION = 'pbjs_lite';
 
-function isSecure() {
-  return location.protocol === 'https:';
-}
-
-// use protocol relative urls for http or https
-export const FASTLANE_ENDPOINT = '//fastlane.rubiconproject.com/a/api/fastlane.json';
-export const VIDEO_ENDPOINT = '//prebid-server.rubiconproject.com/openrtb2/auction';
+// always use https, regardless of whether or not current page is secure
+export const FASTLANE_ENDPOINT = 'https://fastlane.rubiconproject.com/a/api/fastlane.json';
+export const VIDEO_ENDPOINT = 'https://prebid-server.rubiconproject.com/openrtb2/auction';
 export const SYNC_ENDPOINT = 'https://eus.rubiconproject.com/usync.html';
 
 const DIGITRUST_PROP_NAMES = {
@@ -153,7 +149,7 @@ export const spec = {
         imp: [{
           exp: 300,
           id: bidRequest.adUnitCode,
-          secure: isSecure() || bidRequest.params.secure ? 1 : 0,
+          secure: 1,
           ext: {
             rubicon: bidRequest.params
           },
@@ -397,7 +393,7 @@ export const spec = {
       'size_id': parsedSizes[0],
       'alt_size_ids': parsedSizes.slice(1).join(',') || undefined,
       'rp_floor': (params.floor = parseFloat(params.floor)) > 0.01 ? params.floor : 0.01,
-      'rp_secure': isSecure() ? '1' : '0',
+      'rp_secure': '1',
       'tk_flint': `${configIntType || DEFAULT_INTEGRATION}_v$prebid.version$`,
       'x_source.tid': bidRequest.transactionId,
       'p_screen_res': _getScreenResolution(),
diff --git a/test/spec/modules/rubiconBidAdapter_spec.js b/test/spec/modules/rubiconBidAdapter_spec.js
index 0390d4598ae..a3e53c68294 100644
--- a/test/spec/modules/rubiconBidAdapter_spec.js
+++ b/test/spec/modules/rubiconBidAdapter_spec.js
@@ -316,7 +316,7 @@ describe('the rubicon adapter', function () {
           let [request] = spec.buildRequests(bidderRequest.bids, bidderRequest);
           let data = parseQuery(request.data);
 
-          expect(request.url).to.equal('//fastlane.rubiconproject.com/a/api/fastlane.json');
+          expect(request.url).to.equal('https://fastlane.rubiconproject.com/a/api/fastlane.json');
 
           let expectedQuery = {
             'account_id': '14062',
@@ -454,7 +454,7 @@ describe('the rubicon adapter', function () {
           let [request] = spec.buildRequests(bidderRequest.bids, bidderRequest);
           let data = parseQuery(request.data);
 
-          expect(request.url).to.equal('//fastlane.rubiconproject.com/a/api/fastlane.json');
+          expect(request.url).to.equal('https://fastlane.rubiconproject.com/a/api/fastlane.json');
 
           // test that all values above are both present and correct
           Object.keys(expectedQuery).forEach(key => {
@@ -470,7 +470,7 @@ describe('the rubicon adapter', function () {
           [request] = spec.buildRequests(bidderRequest.bids, bidderRequest);
           data = parseQuery(request.data);
 
-          expect(request.url).to.equal('//fastlane.rubiconproject.com/a/api/fastlane.json');
+          expect(request.url).to.equal('https://fastlane.rubiconproject.com/a/api/fastlane.json');
 
           // test that all values above are both present and correct
           Object.keys(expectedQuery).forEach(key => {
@@ -967,7 +967,7 @@ describe('the rubicon adapter', function () {
               expect(item).to.have.property('bidRequest');
 
               expect(item.method).to.equal('GET');
-              expect(item.url).to.equal('//fastlane.rubiconproject.com/a/api/fastlane.json');
+              expect(item.url).to.equal('https://fastlane.rubiconproject.com/a/api/fastlane.json');
               expect(item.data).to.be.a('string');
 
               // 'bidRequest' type must be 'array' if SRA enabled