From 25459d4682c7fa223d6a1a5a9e941003f30e3442 Mon Sep 17 00:00:00 2001
From: Ryan Schweitzer <50628828+r-schweitzer@users.noreply.github.com>
Date: Mon, 8 Mar 2021 11:57:29 +0000
Subject: [PATCH] PBS Bid Adapter: fix s2s alias collision with built-in
 adapter aliasing (#6379)

* fixed overwriting of aliases for s2s

* made change

* added fix
---
 modules/prebidServerBidAdapter/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 20cf93caae5..088b5430f46 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -724,7 +724,7 @@ const OPEN_RTB_PROTOCOL = {
     }
 
     if (!utils.isEmpty(aliases)) {
-      request.ext.prebid.aliases = aliases;
+      request.ext.prebid.aliases = {...request.ext.prebid.aliases, ...aliases};
     }
 
     const bidUserIdAsEids = utils.deepAccess(bidRequests, '0.bids.0.userIdAsEids');