diff --git a/README.md b/README.md
index 4002df70..5687456c 100644
--- a/README.md
+++ b/README.md
@@ -152,22 +152,6 @@ rails generate factory_bot:model NAME [field:type field:type] [options]
 
 [default factory template]: https://github.com/thoughtbot/factory_bot_rails/tree/main/lib/generators/factory_bot/model/templates/factories.erb
 
-### Active Record Configuration
-
-By default, FactoryBot will refuse to generate Active Record primary key
-columns. Without additional configuration, an Active Record model treats a
-column named `id` as its primary key.
-
-For example, defining an `id` attribute with `add_attribute(:id)`, `id { ... }`,
-or `sequence(:id)` will raise a `FactoryBot::AttributeDefinitionError`.
-
-You can disable this behavior by adding the following to the appropriate environment configuration in `config/environments`
-e.g. `config/environments/test.rb`:
-
-```ruby
-config.factory_bot.reject_primary_key_attributes = false
-```
-
 ## Contributing
 
 Please see [CONTRIBUTING.md](CONTRIBUTING.md).
diff --git a/lib/factory_bot_rails/factory_validator/active_record_validator.rb b/lib/factory_bot_rails/factory_validator/active_record_validator.rb
deleted file mode 100644
index 6ad2cc12..00000000
--- a/lib/factory_bot_rails/factory_validator/active_record_validator.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-module FactoryBotRails
-  class FactoryValidator
-    class ActiveRecordValidator
-      def validate!(payload)
-        attributes, for_class = payload.values_at(:attributes, :class)
-        attributes.each do |attribute|
-          if for_class < ActiveRecord::Base && for_class.primary_key == attribute.name.to_s
-            raise FactoryBot::AttributeDefinitionError, <<~ERROR
-              Attribute generates #{for_class.primary_key.inspect} primary key for #{for_class.name}"
-
-              Do not define #{for_class.primary_key.inspect}. Instead, rely on the database to generate it.
-            ERROR
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/lib/factory_bot_rails/railtie.rb b/lib/factory_bot_rails/railtie.rb
index de539cf2..0e7dfdb8 100644
--- a/lib/factory_bot_rails/railtie.rb
+++ b/lib/factory_bot_rails/railtie.rb
@@ -10,7 +10,6 @@ module FactoryBotRails
   class Railtie < Rails::Railtie
     config.factory_bot = ActiveSupport::OrderedOptions.new
     config.factory_bot.definition_file_paths = FactoryBot.definition_file_paths
-    config.factory_bot.reject_primary_key_attributes = true
     config.factory_bot.validator = FactoryBotRails::FactoryValidator.new
 
     initializer "factory_bot.set_fixture_replacement" do
@@ -21,18 +20,6 @@ class Railtie < Rails::Railtie
       FactoryBot.definition_file_paths = definition_file_paths
     end
 
-    initializer "factory_bot.reject_primary_key_attributes" do
-      ActiveSupport.on_load :active_record do
-        config = Rails.configuration.factory_bot
-
-        if config.reject_primary_key_attributes
-          require "factory_bot_rails/factory_validator/active_record_validator"
-
-          config.validator.add_validator FactoryValidator::ActiveRecordValidator.new
-        end
-      end
-    end
-
     config.after_initialize do |app|
       FactoryBot.find_definitions
       Reloader.new(app).run
diff --git a/spec/factory_bot_rails/factory_validator/active_record_validator_spec.rb b/spec/factory_bot_rails/factory_validator/active_record_validator_spec.rb
deleted file mode 100644
index 000476cc..00000000
--- a/spec/factory_bot_rails/factory_validator/active_record_validator_spec.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-describe FactoryBotRails::FactoryValidator do
-  before { FactoryBot.reload }
-
-  describe "ActiveRecordValidator" do
-    context "when defined with a class that descends from ActiveRecord::Base" do
-      it "raises an error for a sequence generating its primary key" do
-        define_model "Article", an_id: :integer do
-          self.primary_key = :an_id
-        end
-
-        FactoryBot.define do
-          factory :article do
-            sequence(:an_id)
-          end
-        end
-
-        expect { FactoryBot.create(:article) }
-          .to raise_error(FactoryBot::AttributeDefinitionError)
-      end
-    end
-  end
-end