diff --git a/app/controllers/scimitar/application_controller.rb b/app/controllers/scimitar/application_controller.rb
index 4e29857..bc4410c 100644
--- a/app/controllers/scimitar/application_controller.rb
+++ b/app/controllers/scimitar/application_controller.rb
@@ -126,6 +126,7 @@ def add_mandatory_response_headers
         #
         response.set_header('WWW_AUTHENTICATE', 'Basic' ) if Scimitar.engine_configuration.basic_authenticator.present?
         response.set_header('WWW_AUTHENTICATE', 'Bearer') if Scimitar.engine_configuration.token_authenticator.present?
+        response.set_header('Content-Type', 'application/scim+json; charset=utf-8')
       end
 
       def authenticate