diff --git a/lib/deflate.js b/lib/deflate.js
index feb65ac..60ccdda 100644
--- a/lib/deflate.js
+++ b/lib/deflate.js
@@ -117,6 +117,7 @@ var Z_DEFLATED  = 8;
  * ```
  **/
 function Deflate(options) {
+  if (!(this instanceof Deflate)) return new Deflate(options);
 
   this.options = utils.assign({
     level: Z_DEFAULT_COMPRESSION,
diff --git a/lib/inflate.js b/lib/inflate.js
index 70ab3b7..95610a8 100644
--- a/lib/inflate.js
+++ b/lib/inflate.js
@@ -90,6 +90,7 @@ var toString = Object.prototype.toString;
  * ```
  **/
 function Inflate(options) {
+  if (!(this instanceof Inflate)) return new Inflate(options);
 
   this.options = utils.assign({
     chunkSize: 16384,