diff --git a/lib/fog/aws/models/cloud_watch/alarm.rb b/lib/fog/aws/models/cloud_watch/alarm.rb
index ff89c2feb..60ce9bf4d 100644
--- a/lib/fog/aws/models/cloud_watch/alarm.rb
+++ b/lib/fog/aws/models/cloud_watch/alarm.rb
@@ -40,6 +40,8 @@ module Fog
           requires :period
           requires :statistic
           requires :threshold
+          requires :namespace
+          requires :evaluation_periods
 
 
           options = Hash[self.class.aliases.map { |key, value| [key, send(value)] }]