diff --git a/app/views/fluentd/settings/in_tail/_form.html.haml b/app/views/fluentd/settings/in_tail/_form.html.haml
index 67f1827..78ed465 100644
--- a/app/views/fluentd/settings/in_tail/_form.html.haml
+++ b/app/views/fluentd/settings/in_tail/_form.html.haml
@@ -15,6 +15,7 @@
   - parse_config = setting.create_parser
   = form.fields("parse[0]", model: parse_config, builder: FluentdFormBuilder) do |f|
     - f.object.common_options.each do |key|
+      = f.hidden_field(key)
       = f.field(key, disabled: true)
 
 = form.field(:tag)