1 files changed, 0 insertions, 3 deletions
diff --git a/bin/gitbook.js b/bin/gitbook.js
index c2c2e31..208d2ea 100755
--- a/bin/gitbook.js
+++ b/bin/gitbook.js
@@ -83,10 +83,7 @@ build.command(prog.command('serve [source_dir]'))
 build.commandEbook(prog.command('ebook [source_dir]'))
 .description('Build a gitbook as a eBook (format detected according to the extension)')
 .action(function(dir, options) {
-    var ext = options.output ? path.extname(options.output) : "epub";
-
     build.file(dir, _.extend(options, {
-        extension: ext,
         format: "ebook"
     }));
 });