diff --git a/lib/dns.js b/lib/dns.js
index e77542457b5cd1..e165b1bc0d2f05 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -243,7 +243,7 @@ function resolver(bindingName) {
 }
 
 
-var resolveMap = {};
+var resolveMap = Object.create(null);
 exports.resolve4 = resolveMap.A = resolver('queryA');
 exports.resolve6 = resolveMap.AAAA = resolver('queryAaaa');
 exports.resolveCname = resolveMap.CNAME = resolver('queryCname');