diff --git a/templates/hosts.conf.j2 b/templates/hosts.conf.j2
index abb4e8a..fc6e1eb 100644
--- a/templates/hosts.conf.j2
+++ b/templates/hosts.conf.j2
@@ -2,10 +2,10 @@
 {% for host in munin_hosts %}
 [{{ host.name }}]
     address {{ host.address }}
-{% if host.extra %}
+{% if host.extra is defined %}
 {% for extra in host.extra %}
     {{ extra }}
 {% endfor %}
 {% endif %}
 
-{% endfor %}
\ No newline at end of file
+{% endfor %}