diff --git a/global/overlay/etc/puppet/modules/dns/manifests/knotdns.pp b/global/overlay/etc/puppet/modules/dns/manifests/knotdns.pp
index d4dbb9b..f96f660 100644
--- a/global/overlay/etc/puppet/modules/dns/manifests/knotdns.pp
+++ b/global/overlay/etc/puppet/modules/dns/manifests/knotdns.pp
@@ -1,7 +1,7 @@
 class dns::knotdns(
-    $knotdnsrepo = "ppa:cz.nic-labs/knot-dns-latest"
-    $knotrestrepo = "ppa:pettai/knot-rest"
-    $knotrestversion = "0.0.2-1"
+    $knotdnsrepo = 'ppa:cz.nic-labs/knot-dns-latest'
+    $knotrestrepo = 'ppa:pettai/knot-rest'
+    $knotrestversion = '0.0.2-1'
 ){
 
     # This is a control file used to skip these semi-heavy installation steps