diff --git a/lib/dns.js b/lib/dns.js
index aad0ebb17cee12..09076a6b4bbd37 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -46,7 +46,7 @@ function errnoException(err, syscall, hostname) {
   }
   var ex = null;
   if (typeof err === 'string') {  // c-ares error code.
-    const errHost = hostname ? ' ' + hostname : '';
+    const errHost = hostname ? ` ${hostname}` : '';
     ex = new Error(`${syscall} ${err}${errHost}`);
     ex.code = err;
     ex.errno = err;