diff --git a/lib/rails_ext/active_record_replica_support.rb b/lib/rails_ext/active_record_replica_support.rb
index 8b9e63a98..d533c6dd2 100644
--- a/lib/rails_ext/active_record_replica_support.rb
+++ b/lib/rails_ext/active_record_replica_support.rb
@@ -49,4 +49,6 @@ module ActiveRecordReplicaSupport
   end
 end
 
-ActiveRecord::Base.include ActiveRecordReplicaSupport
+ActiveSupport.on_load(:active_record) do
+  include ActiveRecordReplicaSupport
+end