diff --git a/server/routers/badger/exchangeSession.ts b/server/routers/badger/exchangeSession.ts
index e6c8b70f1..08987961d 100644
--- a/server/routers/badger/exchangeSession.ts
+++ b/server/routers/badger/exchangeSession.ts
@@ -198,7 +198,7 @@ export async function exchangeSession(
         const cookieName = `${config.getRawConfig().server.session_cookie_name}`;
         const cookie = serializeResourceSessionCookie(
             cookieName,
-            resource.fullDomain!,
+            cleanHost,
             token,
             !resource.ssl,
             expiresAt ? new Date(expiresAt) : undefined