diff --git a/lib/active_admin/views/pages/base.rb b/lib/active_admin/views/pages/base.rb
index d7d77ff801c..6894b798862 100644
--- a/lib/active_admin/views/pages/base.rb
+++ b/lib/active_admin/views/pages/base.rb
@@ -17,6 +17,7 @@ def add_classes_to_body
           @body.add_class(params[:action])
           @body.add_class(params[:controller].gsub('/', '_'))
           @body.add_class("logged_in")
+          @body.add_class(active_admin_namespace.name.to_s + "_namespace")
         end
 
         def build_active_admin_head