diff --git a/lib/active_resource/railtie.rb b/lib/active_resource/railtie.rb
index 0a0492de58..dc4e08d6af 100644
--- a/lib/active_resource/railtie.rb
+++ b/lib/active_resource/railtie.rb
@@ -23,7 +23,9 @@ class Railtie < Rails::Railtie
     end
 
     initializer "active_resource.deprecator" do |app|
-      app.deprecators[:active_resource] = ActiveResource.deprecator
+      if app.respond_to?(:deprecators)
+        app.deprecators[:active_resource] = ActiveResource.deprecator
+      end
     end
   end
 end