diff --git a/lib/redmine_dmsf.rb b/lib/redmine_dmsf.rb
index bfa2c113..0f6b647b 100644
--- a/lib/redmine_dmsf.rb
+++ b/lib/redmine_dmsf.rb
@@ -106,7 +106,7 @@ module RedmineDmsf
     end
 
     def dmsf_act_as_attachable?
-      value = Setting.plugin_redmine_dmsf['dmsf_act_as_attachable?']
+      value = Setting.plugin_redmine_dmsf['dmsf_act_as_attachable']
       value.to_i.positive? || value == 'true'
     end