diff --git a/app/models/physical_rack.rb b/app/models/physical_rack.rb
index e2ae9498d3cc..10f69e554354 100644
--- a/app/models/physical_rack.rb
+++ b/app/models/physical_rack.rb
@@ -5,7 +5,8 @@ class PhysicalRack < ApplicationRecord
   include SupportsFeatureMixin
   include EventMixin
 
-  belongs_to :ext_management_system, :foreign_key => :ems_id, :class_name => "ManageIQ::Providers::PhysicalInfraManager"
+  belongs_to :ext_management_system, :foreign_key => :ems_id,
+             :class_name => "ManageIQ::Providers::PhysicalInfraManager", :inverse_of => :physical_racks
 
   has_many :physical_servers, :dependent => :destroy, :inverse_of => :physical_rack
 end
diff --git a/spec/factories/physical_rack.rb b/spec/factories/physical_rack.rb
new file mode 100644
index 000000000000..00f100085f40
--- /dev/null
+++ b/spec/factories/physical_rack.rb
@@ -0,0 +1,3 @@
+FactoryGirl.define do
+  factory :physical_rack
+end