diff --git a/config/application.rb b/config/application.rb
index 8f7470702a9..b70dee1afb2 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -60,7 +60,7 @@ class Application < Rails::Application
     config.encoding = "utf-8"
 
     # Configure sensitive parameters which will be filtered from the log file.
-    config.filter_parameters += [:password, :verify, :data, :_pwd, :__protected]
+    config.filter_parameters += [:password, :verify, :data, :auth_key, :_pwd, :__protected]
 
     # Enable escaping HTML in JSON.
     config.active_support.escape_html_entities_in_json = true