diff --git a/app/assets/javascripts/discourse/views/header_view.js b/app/assets/javascripts/discourse/views/header_view.js
index dab7f91f4..80fd2620c 100644
--- a/app/assets/javascripts/discourse/views/header_view.js
+++ b/app/assets/javascripts/discourse/views/header_view.js
@@ -99,12 +99,12 @@ Discourse.HeaderView = Discourse.View.extend({
     if (this.get('controller.showExtraInfo')) {
       var logo = Discourse.SiteSettings.logo_small_url;
       if (logo && logo.length > 1) {
-        result += "<img src='" + logo + "' width='33' height='33'>";
+        result += "<img class='logo-small' src='" + logo + "' width='33' height='33'>";
       } else {
         result += "<i class='icon-home'></i>";
       }
     } else {
-      result += "<img src=\"" + Discourse.SiteSettings.logo_url + "\" alt=\"" + Discourse.SiteSettings.title + "\" id='site-logo'>";
+      result += "<img class='logo-big' src=\"" + Discourse.SiteSettings.logo_url + "\" alt=\"" + Discourse.SiteSettings.title + "\" id='site-logo'>";
     }
     result += "</a></div>";
     return new Handlebars.SafeString(result);