diff --git a/config/application.rb b/config/application.rb
index 577d127993a..9ceaaa7190c 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -103,6 +103,7 @@ module Discourse
         :password,
         :pop3_polling_password,
         :api_key,
+        :api_username,
         :s3_secret_access_key,
         :twitter_consumer_secret,
         :facebook_app_secret,