diff --git a/src/binding.js b/src/binding.js
index 14e419d..66efdb5 100644
--- a/src/binding.js
+++ b/src/binding.js
@@ -3,10 +3,10 @@
 
 var assert = require('assert')
 
-var Zstream = require('pako/lib/zlib/zstream')
+var Zstream = require('pako/lib/zlib/zstream.js')
 var zlib_deflate = require('pako/lib/zlib/deflate.js')
 var zlib_inflate = require('pako/lib/zlib/inflate.js')
-var constants = require('pako/lib/zlib/constants')
+var constants = require('pako/lib/zlib/constants.js')
 
 for (var key in constants) {
   exports[key] = constants[key]
diff --git a/src/index.js b/src/index.js
index 12f1ad0..f8b02be 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,7 @@
 
 const Buffer = require('buffer').Buffer;
 const Transform = require('stream').Transform;
-const binding = require('./binding');
+const binding = require('./binding.js');
 const util = require('util');
 const assert = require('assert').ok;
 const kMaxLength = require('buffer').kMaxLength;