diff --git a/lib/addons/prototypes/analytics.js b/lib/addons/prototypes/analytics.js
index c55654b..972549d 100644
--- a/lib/addons/prototypes/analytics.js
+++ b/lib/addons/prototypes/analytics.js
@@ -114,7 +114,7 @@ class OptablePrebidAnalytics {
       bidderRequests: bidderRequests.map((br) => {
         const { bidderCode, bidderRequestId, ortb2, bids = [] } = br;
         const domain = ortb2?.site?.domain;
-        const eids = ortb2?.user?.ext?.eids || ortb2.user?.eids || [];
+        const eids = [...(ortb2?.user?.ext?.eids ?? []), ...(ortb2?.user?.eids ?? [])];
 
         // Optable EIDs
         const optableEIDS = eids.filter((e) => e.inserter === "optable.co");