diff --git a/app/models/ext_management_system.rb b/app/models/ext_management_system.rb
index eda5beb144e..377ccad7443 100644
--- a/app/models/ext_management_system.rb
+++ b/app/models/ext_management_system.rb
@@ -54,7 +54,7 @@ def self.supported_types_and_descriptions_hash
   has_many :policy_events,  -> { order("timestamp") }, :class_name => "PolicyEvent", :foreign_key => "ems_id"
 
   has_many :blacklisted_events, :foreign_key => "ems_id", :dependent => :destroy, :inverse_of => :ext_management_system
-  has_many :miq_alert_statuses, :foreign_key => "ems_id"
+  has_many :miq_alert_statuses, :foreign_key => "ems_id", :dependent => :destroy
   has_many :ems_folders,    :foreign_key => "ems_id", :dependent => :destroy, :inverse_of => :ext_management_system
   has_many :ems_clusters,   :foreign_key => "ems_id", :dependent => :destroy, :inverse_of => :ext_management_system
   has_many :resource_pools, :foreign_key => "ems_id", :dependent => :destroy, :inverse_of => :ext_management_system