diff --git a/lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb b/lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb
index 4c0a1c8a5..6e48ff4b7 100644
--- a/lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb
+++ b/lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb
@@ -103,7 +103,7 @@ module Redmine
             end
 
             if provider_options.has_key?(:permission)
-              user1 = User.find_by_login('user')
+              user1 = User.find_by_admin(true)
               scope = scope.scoped(:conditions => Project.allowed_to_condition(user1, provider_options[:permission] || :view_project, options))
             elsif respond_to?(:visible)
               scope = scope.visible(user1, options)