diff --git a/bulma.js b/bulma.js
index 9812c52..45d0f0f 100644
--- a/bulma.js
+++ b/bulma.js
@@ -75,7 +75,7 @@
       var useContainer, classes, innerNavbar;
       args || (args = {});
       useContainer = args.useContainer || false;
-      classes = args.classes || void 8;
+      classes = args.classes || {};
       innerNavbar = function(){
         var start, end;
         return [args.brand ? h('div.navbar-brand', args.brand) : void 8, args.start || args.end ? h('div.navbar-menu', [(start = args.start) ? h('div.navbar-start', start) : void 8, (end = args.end) ? h('div.navbar-end', end) : void 8]) : void 8];
diff --git a/bulma.ls b/bulma.ls
index a1c5c24..1e32aeb 100644
--- a/bulma.ls
+++ b/bulma.ls
@@ -85,7 +85,7 @@ module.exports = {
 		args or= {}
 
 		use-container = args.use-container || false
-		classes       = args.classes || void
+		classes       = args.classes || {}
 
 		inner-navbar = -> [
 			if args.brand