diff --git a/app/models/miq_request_workflow.rb b/app/models/miq_request_workflow.rb
index f6ae2bc611d..820011cfd5f 100644
--- a/app/models/miq_request_workflow.rb
+++ b/app/models/miq_request_workflow.rb
@@ -830,8 +830,12 @@ def find_classes_under_ci(item, klass)
 
   def load_ems_node(item, log_header)
     @ems_xml_nodes ||= {}
-    klass_name = item.kind_of?(MiqHashStruct) ? item.evm_object_class : item.class.base_class.name
-    node = @ems_xml_nodes["#{klass_name}_#{item.id}"]
+    klass_name = if item.kind_of?(MiqHashStruct)
+                   Object.const_get(item.evm_object_class)
+                 else
+                   item.class.base_class
+                 end
+    node = @ems_xml_nodes[klass_name][item.id]
     $log.error "#{log_header} Resource <#{klass_name}_#{item.id} - #{item.name}> not found in cached resource tree." if node.nil?
     node
   end
@@ -948,7 +952,8 @@ def ems_metadata_tree_add_hosts_under_clusters!(result)
 
   def convert_to_xml(xml, result)
     result.each do |obj, children|
-      @ems_xml_nodes["#{obj.class.base_class}_#{obj.id}"] = node = xml.add_element(obj.class.base_class.name, :object => ci_to_hash_struct(obj))
+      @ems_xml_nodes[obj.class.base_class] ||= {}
+      @ems_xml_nodes[obj.class.base_class][obj.id] = node = xml.add_element(obj.class.base_class.name, :object => ci_to_hash_struct(obj))
       convert_to_xml(node, children)
     end
   end
diff --git a/spec/models/miq_request_workflow_spec.rb b/spec/models/miq_request_workflow_spec.rb
index 0ae0e1e8d11..d476c44fb4a 100644
--- a/spec/models/miq_request_workflow_spec.rb
+++ b/spec/models/miq_request_workflow_spec.rb
@@ -465,7 +465,7 @@
       ems_folder.ext_management_system = ems
       attrs = ems_folder.attributes.merge(:object => ems_folder)
       xml_hash = XmlHash::Element.new('EmsFolder', attrs)
-      hash = {"ResourcePool_#{resource_pool.id}" => xml_hash}
+      hash = { ResourcePool => { resource_pool.id => xml_hash } }
       workflow.instance_variable_set("@ems_xml_nodes", hash)
     end
 
@@ -486,7 +486,7 @@
       ems_folder.ext_management_system = ems
       attrs = resource_pool.attributes.merge(:object => resource_pool, :ems => ems)
       xml_hash = XmlHash::Element.new('ResourcePool', attrs)
-      hash = {"EmsFolder_#{ems_folder.id}" => xml_hash}
+      hash = { EmsFolder => { ems_folder.id => xml_hash } }
       workflow.instance_variable_set("@ems_xml_nodes", hash)
     end
 
@@ -506,7 +506,7 @@
       datacenter.ext_management_system = ems
       attrs = datacenter.attributes.merge(:object => datacenter, :ems => ems)
       xml_hash = XmlHash::Element.new('EmsFolder', attrs)
-      hash = {"EmsFolder_#{datacenter.id}" => xml_hash}
+      hash = { EmsFolder => { datacenter.id => xml_hash } }
       workflow.instance_variable_set("@ems_xml_nodes", hash)
     end