diff --git a/app/models/agent.rb b/app/models/agent.rb
index 56ee301c4e..723f79e320 100644
--- a/app/models/agent.rb
+++ b/app/models/agent.rb
@@ -418,7 +418,7 @@ def run_schedule(schedule)
       return if schedule == 'never'
       types = where(:schedule => schedule).group(:type).pluck(:type)
       types.each do |type|
-        next unless const_defined?(type)
+        next unless valid_type?(type)
         type.constantize.bulk_check(schedule)
       end
     end