diff --git a/lib/active_record/session_store.rb b/lib/active_record/session_store.rb
index 1352472..fde698d 100644
--- a/lib/active_record/session_store.rb
+++ b/lib/active_record/session_store.rb
@@ -1,3 +1,4 @@
+require 'active_record'
 require 'active_record/session_store/version'
 require 'action_dispatch/session/active_record_store'
 require "active_record/session_store/extension/logger_silencer"