diff --git a/README.md b/README.md
index 57b06f6..918c75f 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,11 @@
 
     npm install epub
 
+Or, if you want a pure-JS version (useful if used in a Node-Webkit app for example):
+
+    npm install epub --no-optional
+
+
 ## Usage
 
     var EPub = require("epub");
diff --git a/epub.js b/epub.js
index 7ee4380..c1e1a5a 100644
--- a/epub.js
+++ b/epub.js
@@ -3,6 +3,29 @@ var XML2JS = require("xml2js").Parser;
 var utillib = require("util");
 var EventEmitter = require('events').EventEmitter;
 
+try {
+    // zipfile is an optional dependency:
+    var ZipFile = require("zipfile").ZipFile;
+} catch (err) {
+    // Mock zipfile using pure-JS adm-zip:
+    var AdmZip = require('adm-zip');
+    
+    var ZipFile = function(filename) {
+        this.admZip = new AdmZip(filename);
+        this.names = this.admZip.getEntries().map(function(zipEntry) {
+            return zipEntry.entryName;
+        });
+        this.count = this.names.length;
+    };
+    ZipFile.prototype.readFile = function(name, cb) {
+        this.admZip.readFileAsync(this.admZip.getEntry(name), function(buffer, error) {
+            // `error` is bogus right now, so let's just drop it.
+            // see https://github.com/cthackers/adm-zip/pull/88
+            return cb(null, buffer);
+        });
+    };
+}
+
 //TODO: Cache parsed data
 
 /**
diff --git a/package.json b/package.json
index 5362d4f..5b7ed5a 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "epub",
   "description": "Parse ePub electronic book files with Node.JS",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "author": "Andris Reinman",
   "contributors": [
     {
@@ -27,9 +27,12 @@
     }
   ],
   "dependencies": {
-    "zipfile": "^0.5.0",
+    "adm-zip": "^0.4.4",
     "xml2js": "~0.1.0"
   },
+  "optionalDependencies": {
+    "zipfile": "^0.5.0"
+  },
   "engine": [
     "node >=0.3.0"
   ],