diff --git a/test/manual/socks5.test.ts b/test/manual/socks5.test.ts
index 98170312687..3da4b53979d 100644
--- a/test/manual/socks5.test.ts
+++ b/test/manual/socks5.test.ts
@@ -34,6 +34,7 @@ describe('Socks5 Connectivity', function () {
   }
   rsConnectionString.searchParams.set('serverSelectionTimeoutMS', '2000');
   singleConnectionString.searchParams.set('serverSelectionTimeoutMS', '2000');
+  singleConnectionString.searchParams.set('readPreference', 'primaryPreferred');
 
   installNodeDNSWorkaroundHooks();