diff --git a/app/models/time_entry.rb b/app/models/time_entry.rb
index 4f2c561..984c2c3 100644
--- a/app/models/time_entry.rb
+++ b/app/models/time_entry.rb
@@ -17,7 +17,7 @@ class TimeEntry < ActiveRecord::Base
   end
   
   def validate
-    errors.add :hours, :activerecord_error_invalid if hours && hours < 0
+    errors.add :hours, :activerecord_error_invalid if hours && (hours < 0 || hours >= 1000)
     errors.add :project_id, :activerecord_error_invalid if project.nil?
     errors.add :issue_id, :activerecord_error_invalid if (issue_id && !issue) || (issue && project!=issue.project)
   end