diff --git a/lib/cybele/app_builder.rb b/lib/cybele/app_builder.rb
index bc059d9..3a49516 100644
--- a/lib/cybele/app_builder.rb
+++ b/lib/cybele/app_builder.rb
@@ -117,7 +117,7 @@ def setup_staging_environment
       run 'cp config/environments/production.rb config/environments/staging.rb'
 
       prepend_file 'config/environments/staging.rb',
-                   "Mail.register_interceptor RecipientInterceptor.new((Settings.email.noreply, subject_prefix: '[STAGING]'))\n"
+                   "Mail.register_interceptor RecipientInterceptor.new(Settings.email.noreply, subject_prefix: '[STAGING]')\n"
 
       config = <<-YML
 email:
@@ -328,4 +328,4 @@ def set_user_time_zone
       end
     end
   end
-end
\ No newline at end of file
+end