diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index eb2769f1efe36916e59995e4167aa40e8d797cbf..3091197bc29bb82c490545020cc268b53040884f 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -42,6 +42,10 @@ class Railtie < Rails::Railtie
       Rails.logger.extend ActiveSupport::Logger.broadcast console
     end
 
+    runner do |app|
+      require "active_record/base"
+    end
+
     initializer "active_record.initialize_timezone" do
       ActiveSupport.on_load(:active_record) do
         self.time_zone_aware_attributes = true