diff --git a/app/assets/javascripts/discourse/models/category.js b/app/assets/javascripts/discourse/models/category.js
index 49071428f40..4cc585a3f37 100644
--- a/app/assets/javascripts/discourse/models/category.js
+++ b/app/assets/javascripts/discourse/models/category.js
@@ -29,6 +29,10 @@ Discourse.Category = Discourse.Model.extend({
     return Discourse.getURL("/category/") + Discourse.Category.slugFor(this);
   }.property('name'),
 
+  nameLower: function() {
+    return this.get('name').toLowerCase();
+  }.property('name'),
+
   unreadUrl: function() {
     return this.get('url') + '/l/unread';
   }.property('url'),
diff --git a/app/assets/javascripts/discourse/models/nav_item.js b/app/assets/javascripts/discourse/models/nav_item.js
index 33986b1228b..365c6f1b8ed 100644
--- a/app/assets/javascripts/discourse/models/nav_item.js
+++ b/app/assets/javascripts/discourse/models/nav_item.js
@@ -21,7 +21,7 @@ Discourse.NavItem = Discourse.Model.extend({
   categorySlug: function() {
     var split = this.get('name').split('/');
     if (split[0] === 'category' && split[1]) {
-      var cat = Discourse.Site.current().categories.findProperty('name', split[1]);
+      var cat = Discourse.Site.current().categories.findProperty('nameLower', split[1].toLowerCase());
       return cat ? Discourse.Category.slugFor(cat) : null;
     }
     return null;