diff --git a/puppet/templates/puppet.conf.erb b/puppet/templates/puppet.conf.erb
index 9b2d447..f4e9b9b 100644
--- a/puppet/templates/puppet.conf.erb
+++ b/puppet/templates/puppet.conf.erb
@@ -60,8 +60,5 @@
     # The default value is '$confdir/localconfig'.
     localconfig = $vardir/localconfig
 
-    # Use yaml for serialization (kerberos keytabs fail with pson)
-    preferred_serialization_format = yaml
-
     # Enable dot graphs of configuration depencies
     graph = true