diff --git a/nip05.ts b/nip05.ts
index cb86604..c2303f8 100644
--- a/nip05.ts
+++ b/nip05.ts
@@ -37,6 +37,7 @@ export async function queryProfile(
   }
 
   if (!name.match(/^[A-Za-z0-9-_]+$/)) return null
+  if (!domain.includes('.')) return null
 
   let res
   try {