diff --git a/modules/yieldlabBidAdapter.js b/modules/yieldlabBidAdapter.js
index 6cfa0c1a548..9c2b6abf475 100644
--- a/modules/yieldlabBidAdapter.js
+++ b/modules/yieldlabBidAdapter.js
@@ -42,6 +42,11 @@ export const spec = {
       if (bid.userIdAsEids && Array.isArray(bid.userIdAsEids)) {
         query.ids = createUserIdString(bid.userIdAsEids)
       }
+      if (bid.params.customParams && utils.isPlainObject(bid.params.customParams)) {
+        for (let prop in bid.params.customParams) {
+          query[prop] = bid.params.customParams[prop]
+        }
+      }
     })
 
     if (bidderRequest && bidderRequest.gdprConsent) {
diff --git a/test/spec/modules/yieldlabBidAdapter_spec.js b/test/spec/modules/yieldlabBidAdapter_spec.js
index 5dcd112228a..097f85b9b8d 100644
--- a/test/spec/modules/yieldlabBidAdapter_spec.js
+++ b/test/spec/modules/yieldlabBidAdapter_spec.js
@@ -12,6 +12,10 @@ const REQUEST = {
       'key1': 'value1',
       'key2': 'value2'
     },
+    'customParams': {
+      'extraParam': true,
+      'foo': 'bar'
+    },
     'extId': 'abc'
   },
   'bidderRequestId': '143346cf0f1731',
@@ -88,6 +92,10 @@ describe('yieldlabBidAdapter', function () {
       expect(request.url).to.include('ids=netid.de%3AfH5A3n2O8_CZZyPoJVD-eabc6ECb7jhxCicsds7qSg')
     })
 
+    it('passes extra params to bid request', function () {
+      expect(request.url).to.include('extraParam=true&foo=bar')
+    })
+
     const gdprRequest = spec.buildRequests(bidRequests, {
       gdprConsent: {
         consentString: 'BN5lERiOMYEdiAKAWXEND1AAAAE6DABACMA',