diff --git a/app/controllers/projects/wikis_controller.rb b/app/controllers/projects/wikis_controller.rb
index 2d8064c9878..8b6c83d4fed 100644
--- a/app/controllers/projects/wikis_controller.rb
+++ b/app/controllers/projects/wikis_controller.rb
@@ -1,5 +1,3 @@
-require 'project_wiki'
-
 class Projects::WikisController < Projects::ApplicationController
   before_action :authorize_read_wiki!
   before_action :authorize_create_wiki!, only: [:edit, :create, :history]
diff --git a/config/initializers/8_metrics.rb b/config/initializers/8_metrics.rb
index 3e1657b8382..5e0eefdb154 100644
--- a/config/initializers/8_metrics.rb
+++ b/config/initializers/8_metrics.rb
@@ -124,9 +124,9 @@ if Gitlab::Metrics.enabled?
 
   # These are manually require'd so the classes are registered properly with
   # ActiveSupport.
-  require 'gitlab/metrics/subscribers/action_view'
-  require 'gitlab/metrics/subscribers/active_record'
-  require 'gitlab/metrics/subscribers/rails_cache'
+  require_dependency 'gitlab/metrics/subscribers/action_view'
+  require_dependency 'gitlab/metrics/subscribers/active_record'
+  require_dependency 'gitlab/metrics/subscribers/rails_cache'
 
   Gitlab::Application.configure do |config|
     config.middleware.use(Gitlab::Metrics::RackMiddleware)
diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
index ab5a0561b8c..f7fa6d1c2de 100644
--- a/config/initializers/omniauth.rb
+++ b/config/initializers/omniauth.rb
@@ -20,15 +20,12 @@ OmniAuth.config.before_request_phase do |env|
 end
 
 if Gitlab.config.omniauth.enabled
-  Gitlab.config.omniauth.providers.each do |provider|
-    if provider['name'] == 'kerberos'
-      require 'omniauth-kerberos'
-    end
-  end
+  provider_names = Gitlab.config.omniauth.providers.map(&:name)
+  require 'omniauth-kerberos' if provider_names.include?('kerberos')
 end
 
 module OmniAuth
   module Strategies
-    autoload :Bitbucket, Rails.root.join('lib', 'omniauth', 'strategies', 'bitbucket')
+    autoload :Bitbucket, Rails.root.join('lib', 'omni_auth', 'strategies', 'bitbucket')
   end
 end
diff --git a/lib/gitlab/ldap/user.rb b/lib/gitlab/ldap/user.rb
index b84c81f1a6c..2d5e47a6f3b 100644
--- a/lib/gitlab/ldap/user.rb
+++ b/lib/gitlab/ldap/user.rb
@@ -1,5 +1,3 @@
-require 'gitlab/o_auth/user'
-
 # LDAP extension for User model
 #
 # * Find or create user from omniauth.auth data
diff --git a/lib/omniauth/strategies/bitbucket.rb b/lib/omni_auth/strategies/bitbucket.rb
similarity index 100%
rename from lib/omniauth/strategies/bitbucket.rb
rename to lib/omni_auth/strategies/bitbucket.rb