diff --git a/modules/openstack_project/files/puppetmaster/hiera.yaml b/modules/openstack_project/files/puppetmaster/hiera.yaml
index 8e930ba95c..2a31856a58 100644
--- a/modules/openstack_project/files/puppetmaster/hiera.yaml
+++ b/modules/openstack_project/files/puppetmaster/hiera.yaml
@@ -1,8 +1,8 @@
 ---
 :hierarchy:
-  - %{operatingsystem}
+  - "%{::operatingsystem}"
   - common
 :backends:
   - yaml
 :yaml:
-  :datadir: '/etc/puppet/hieradata/%{environment}'
+  :datadir: "/etc/puppet/hieradata/%{environment}"