diff --git a/apps/web/lib/plain/plain.ts b/apps/web/lib/plain/plain.ts
index cf4d7c1088..ce851ef24f 100644
--- a/apps/web/lib/plain/plain.ts
+++ b/apps/web/lib/plain/plain.ts
@@ -17,7 +17,7 @@ export const upsertPlainCustomer = async (user: PlainUser) => {
 
   return await plain.upsertCustomer({
     identifier: {
-      externalId: `${user.id}`,
+      emailAddress: email,
     },
     onCreate: {
       fullName,