diff --git a/defaults/main.yml b/defaults/main.yml
index 544bf06..868aae2 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -4,6 +4,7 @@
 samba_workgroup: 'WORKGROUP'
 samba_server_string: 'Fileserver %m'
 samba_log_size: 5000
+samba_interfaces: []
 samba_security: 'user'
 samba_passdb_backend: 'tdbsam'
 samba_map_to_guest: 'bad user'
diff --git a/templates/smb.conf.j2 b/templates/smb.conf.j2
index da0101a..1853d59 100644
--- a/templates/smb.conf.j2
+++ b/templates/smb.conf.j2
@@ -24,7 +24,7 @@
   passdb backend = {{ samba_passdb_backend }}
   map to guest = {{ samba_map_to_guest }}
 
-{% if samba_interfaces is defined %}
+{% if samba_interfaces|length > 0 %}
   interfaces = {{ samba_interfaces }}
 {% endif %}
 
@@ -50,7 +50,7 @@
   writable = yes
 {% endif %}
 
-{% if samba_shares is defined %}
+{% if samba_shares|length > 0 %}
 ## Shared directories
 {% for share in samba_shares %}
 [{{ share.name }}]