diff --git a/build/epub.js b/build/epub.js
index 1dc7c23..c8baba0 100644
--- a/build/epub.js
+++ b/build/epub.js
@@ -3080,12 +3080,12 @@ EPUBJS.Book.prototype.prevPage = function() {
 
 EPUBJS.Book.prototype.nextChapter = function() {
 	var next;
-	if (this.spinePos < this.spine.length - 1) {
+	if (this.spinePos < this.spine.length ) {
 		next = this.spinePos + 1;
 		while (this.spine[next] && this.spine[next].linear && this.spine[next].linear == 'no') {
 			next++;
 		}
-		if (next < this.spine.length - 1) {
+		if (next < this.spine.length ) {
 			return this.displayChapter(next);
 		} else {
 			this.trigger("book:atEnd");
@@ -7401,4 +7401,4 @@ EPUBJS.Unarchiver.prototype.saveEntryFileToStorage = function(entry, callback){
 	});
 };
 
-//# sourceMappingURL=epub.js.map
\ No newline at end of file
+//# sourceMappingURL=epub.js.map
diff --git a/server.js b/server.js
old mode 100644
new mode 100755
index 011617f..3215e94
--- a/server.js
+++ b/server.js
@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 var connect = require('connect'),
 	colors = require('colors'),
 	argv = require('optimist').argv,