diff --git a/lib/dns.js b/lib/dns.js
index 3fd5184d83..7c76aebb97 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -56,9 +56,6 @@ function errnoException(err, syscall, hostname) {
 //   callback.immediately = true;
 // }
 function makeAsync(callback) {
-  if (typeof callback !== 'function') {
-    return callback;
-  }
   return function asyncCallback() {
     if (asyncCallback.immediately) {
       // The API already returned, we can invoke the callback immediately.