1 files changed, 4 insertions, 2 deletions
diff --git a/lib/generators/ebook.js b/lib/generators/ebook.js
index fa5dcbd..b173c19 100644
--- a/lib/generators/ebook.js
+++ b/lib/generators/ebook.js
@@ -12,10 +12,10 @@ var Generator = function(book, format) {
     BaseGenerator.apply(this, arguments);
 
     // eBook format
-    this.ebookFormat = format || "pdf";
+    this.ebookFormat = format;
 
     // Styles to use
-    this.styles = ["ebook", this.ebookFormat];
+    this.styles = _.compact(["ebook", this.ebookFormat]);
 };
 util.inherits(Generator, BaseGenerator);
 
@@ -47,6 +47,8 @@ Generator.prototype.finish = function() {
     	return that.writeSummary();
     })
     .then(function() {
+        if (!that.ebookFormat) return Q();
+
         var d = Q.defer();
 
         if (!that.options.cover && fs.existsSync(path.join(that.options.output, "cover.jpg"))) {