diff --git a/modules/appnexusBidAdapter.js b/modules/appnexusBidAdapter.js
index ff0e3230007..f714472bbb1 100644
--- a/modules/appnexusBidAdapter.js
+++ b/modules/appnexusBidAdapter.js
@@ -229,16 +229,20 @@ export const spec = {
     }
 
     const criteoId = utils.deepAccess(bidRequests[0], `userId.criteoId`);
+    let eids = [];
     if (criteoId) {
       let tpuids = [];
       tpuids.push({
         'provider': 'criteo',
         'user_id': criteoId
       });
+      eids.push({
+        source: 'criteo.com',
+        id: criteoId
+      });
       payload.tpuids = tpuids;
     }
 
-    let eids = [];
     const tdid = utils.deepAccess(bidRequests[0], `userId.tdid`);
     if (tdid) {
       eids.push({
diff --git a/test/spec/modules/appnexusBidAdapter_spec.js b/test/spec/modules/appnexusBidAdapter_spec.js
index 4102896ba94..21d3da358be 100644
--- a/test/spec/modules/appnexusBidAdapter_spec.js
+++ b/test/spec/modules/appnexusBidAdapter_spec.js
@@ -824,6 +824,11 @@ describe('AppNexusAdapter', function () {
         rti_partner: 'TDID'
       });
 
+      expect(payload.eids).to.deep.include({
+        source: 'criteo.com',
+        id: 'sample-criteo-userid',
+      });
+
       expect(payload.tpuids).to.deep.include({
         provider: 'criteo',
         user_id: 'sample-criteo-userid',