diff --git a/lib/zlib.js b/lib/zlib.js
index 605d10338e3..43725bff2d2 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -92,7 +92,7 @@ exports.createUnzip = function(o) {
 // generic zlib
 // minimal 2-byte header
 function Deflate(opts) {
-  if (!(this instanceof Deflate)) return new Deflate(opt);
+  if (!(this instanceof Deflate)) return new Deflate(opts);
   Zlib.call(this, opts, binding.Deflate);
 }