diff --git a/app/controllers/auth_controller.rb b/app/controllers/auth_controller.rb
index 141d84d9..b58261f4 100644
--- a/app/controllers/auth_controller.rb
+++ b/app/controllers/auth_controller.rb
@@ -21,7 +21,6 @@
 
 class AuthController < ApplicationController
   include ExceptionHandler
-  include PlatformValidator
 
   before_action :print_parameters if Rails.configuration.developer_mode_enabled
   skip_before_action :verify_authenticity_token
diff --git a/app/controllers/message_controller.rb b/app/controllers/message_controller.rb
index c633ed32..ff642502 100644
--- a/app/controllers/message_controller.rb
+++ b/app/controllers/message_controller.rb
@@ -27,7 +27,6 @@ class MessageController < ApplicationController
   include OpenIdAuthenticator
   include AppsValidator
   include LtiHelper
-  include PlatformValidator
   include DeepLinkService
 
   before_action :print_parameters if Rails.configuration.developer_mode_enabled
diff --git a/app/controllers/registration_controller.rb b/app/controllers/registration_controller.rb
index 84b7da4f..c878b735 100644
--- a/app/controllers/registration_controller.rb
+++ b/app/controllers/registration_controller.rb
@@ -25,7 +25,6 @@ class RegistrationController < ApplicationController
   include ExceptionHandler
   include LtiHelper
   include OpenIdAuthenticator
-  include PlatformValidator
   include RailsLti2Provider::ControllerHelpers
 
   before_action :print_parameters if Rails.configuration.developer_mode_enabled