diff --git a/dns/templates/zone.master.erb b/dns/templates/zone.master.erb
index 1c9f557..88a8c6c 100644
--- a/dns/templates/zone.master.erb
+++ b/dns/templates/zone.master.erb
@@ -1,7 +1,7 @@
 zone "<%= zone %>" {
         type master;
         file "/etc/bind/db.<%= zone %>";
-    <% if has_variable?('slaves') -%>
+    <% if not slaves.empty? -%>
         allow-transfer {
       <% slaves.each do |slave| -%>
         <%= slave['ipaddr'] %>;