1 files changed, 7 insertions, 2 deletions
diff --git a/lib/output/ebook.js b/lib/output/ebook.js
index 010f3d7..7e7a66d 100644
--- a/lib/output/ebook.js
+++ b/lib/output/ebook.js
@@ -1,9 +1,14 @@
+var util = require('util');
+
 var WebsiteOutput = require('./website');
 var assetsInliner = require('./assets-inliner');
 
-var EbookOutput = assetsInliner(WebsiteOutput);
+function EbookOutput() {
+    WebsiteOutput.apply(this, arguments);
+}
+util.inherits(EbookOutput, WebsiteOutput);
 
 EbookOutput.prototype.name = 'ebook';
 
 
-module.exports = EbookOutput;
+module.exports = assetsInliner(EbookOutput);