diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 00068351d..0add26cf6 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,6 +8,12 @@
 
 require "manageiq/providers/vmware"
 
+RSpec.configure do |config|
+  config.before do
+    YamlPermittedClasses.app_yaml_permitted_classes |= [VimHash, VimString, VimArray]
+  end
+end
+
 VCR.configure do |config|
   config.ignore_hosts 'codeclimate.com' if ENV['CI']
   config.cassette_library_dir = File.join(ManageIQ::Providers::Vmware::Engine.root, 'spec/vcr_cassettes')