diff --git a/lib/puppet/functions/extlib/cache_data.rb b/lib/puppet/functions/extlib/cache_data.rb
index 08f98dc..7ff67b9 100644
--- a/lib/puppet/functions/extlib/cache_data.rb
+++ b/lib/puppet/functions/extlib/cache_data.rb
@@ -34,7 +34,7 @@ def cache_data(namespace, name, initial_data)
     cache = File.join(cache_dir, name)
 
     if File.exist? cache
-      YAML.safe_load(File.read(cache))
+      YAML.safe_load(File.read(cache), [Symbol, Puppet::Pops::Types::PSensitiveType::Sensitive])
     else
       FileUtils.mkdir_p(cache_dir)
       File.open(cache, 'w', 0o600) do |c|