diff --git a/lib/administrate/engine.rb b/lib/administrate/engine.rb
index f0dd56618b..5b486ec935 100644
--- a/lib/administrate/engine.rb
+++ b/lib/administrate/engine.rb
@@ -14,6 +14,7 @@
 require "administrate/order"
 require "administrate/resource_resolver"
 require "administrate/search"
+require "administrate/namespace"
 
 module Administrate
   class Engine < ::Rails::Engine