diff --git a/CHANGES.rst b/CHANGES.rst
index 5d70275..84010d8 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -15,6 +15,9 @@ v0.1.1
 
 - Add support for iPXE boot loader chain-loading and DHCP options. [drybjed]
 
+- Fix a templating error when IPv6 networking is not present on a host.
+  [drybjed]
+
 v0.1.0
 ------
 
diff --git a/defaults/main.yml b/defaults/main.yml
index a2c922c..f165315 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -242,7 +242,8 @@ dhcpd_subnet_default:
     routers: '{{ ansible_default_ipv4.gateway | default("") }}'
     comment: 'Generated automatically by Ansible'
   '6':
-    subnet: '{{ ansible_default_ipv6.address|default("::1") + "/" + ansible_default_ipv6.prefix }}'
+    subnet: '{{ ((ansible_default_ipv6.address + "/" + ansible_default_ipv6.prefix)
+                 if ansible_default_ipv6.address|d() else "") }}'
     comment: 'Generated automatically by Ansible'