diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 151e880e985..a6061b4bad4 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -698,7 +698,7 @@ const OPEN_RTB_PROTOCOL = {
     }
 
     const bidUserId = utils.deepAccess(bidRequests, '0.bids.0.userId');
-    if (bidUserId && typeof bidUserId === 'object' && (bidUserId.tdid || bidUserId.pubcid || bidUserId.parrableid || bidUserId.lipb)) {
+    if (bidUserId && typeof bidUserId === 'object' && (bidUserId.tdid || bidUserId.pubcid || bidUserId.parrableid || bidUserId.lipb || bidUserId.id5id)) {
       utils.deepSetValue(request, 'user.ext.eids', []);
 
       if (bidUserId.tdid) {
@@ -746,6 +746,15 @@ const OPEN_RTB_PROTOCOL = {
         }
         request.user.ext.eids.push(liveIntent);
       }
+
+      if (bidUserId.id5id) {
+        request.user.ext.eids.push({
+          source: 'id5-sync.com',
+          uids: [{
+            id: bidUserId.id5id,
+          }]
+        });
+      }
     }
 
     if (bidRequests && bidRequests[0].gdprConsent) {