diff --git a/modules/appnexusBidAdapter.js b/modules/appnexusBidAdapter.js
index 404a8c04d140..58aa40f5ce93 100644
--- a/modules/appnexusBidAdapter.js
+++ b/modules/appnexusBidAdapter.js
@@ -215,6 +215,13 @@ export const spec = {
         consent_string: bidderRequest.gdprConsent.consentString,
         consent_required: bidderRequest.gdprConsent.gdprApplies
       };
+
+      if (bidderRequest.gdprConsent.addtlConsent && bidderRequest.gdprConsent.addtlConsent.indexOf('~') !== -1) {
+        let ac = bidderRequest.gdprConsent.addtlConsent;
+        // pull only the ids from the string (after the ~) and convert them to an array of ints
+        let acStr = ac.substring(ac.indexOf('~') + 1);
+        payload.gdpr_consent.addtl_consent = acStr.split('.').map(id => parseInt(id, 10));
+      }
     }
 
     if (bidderRequest && bidderRequest.uspConsent) {
diff --git a/test/spec/modules/appnexusBidAdapter_spec.js b/test/spec/modules/appnexusBidAdapter_spec.js
index 4baecdd1ba82..fa2baf0db5f9 100644
--- a/test/spec/modules/appnexusBidAdapter_spec.js
+++ b/test/spec/modules/appnexusBidAdapter_spec.js
@@ -679,7 +679,8 @@ describe('AppNexusAdapter', function () {
         'timeout': 3000,
         'gdprConsent': {
           consentString: consentString,
-          gdprApplies: true
+          gdprApplies: true,
+          addtlConsent: '1~7.12.35.62.66.70.89.93.108'
         }
       };
       bidderRequest.bids = bidRequests;
@@ -691,6 +692,7 @@ describe('AppNexusAdapter', function () {
       expect(payload.gdpr_consent).to.exist;
       expect(payload.gdpr_consent.consent_string).to.exist.and.to.equal(consentString);
       expect(payload.gdpr_consent.consent_required).to.exist.and.to.be.true;
+      expect(payload.gdpr_consent.addtl_consent).to.exist.and.to.deep.equal([7, 12, 35, 62, 66, 70, 89, 93, 108]);
     });
 
     it('should add us privacy string to payload', function() {