diff --git a/roles/dhcpd/defaults/main.yml b/roles/dhcpd/defaults/main.yml
index ed7484c..9c96c1a 100644
--- a/roles/dhcpd/defaults/main.yml
+++ b/roles/dhcpd/defaults/main.yml
@@ -1,5 +1,6 @@
 ---
 
+dhcpd_interfaces: br-{{ site_code }}
 dhcpd_mtu: 1280
 dhcpd_first: "{{ batman_ipv4 | ipaddr('512') | ipaddr('address') }}"
 dhcpd_last: "{{ batman_ipv4 | ipaddr('2558') | ipaddr('address') }}"
diff --git a/roles/dhcpd/tasks/main.yml b/roles/dhcpd/tasks/main.yml
index e3d6d5d..507658b 100644
--- a/roles/dhcpd/tasks/main.yml
+++ b/roles/dhcpd/tasks/main.yml
@@ -7,5 +7,12 @@
   template: src=dhcpd.conf.j2 dest=/etc/dhcp/dhcpd.conf
   notify: Restart isc-dhcp-server
 
+- name: Specify dhcp interfaces
+  lineinfile:
+    dest: /etc/default/isc-dhcp-server
+    line: "INTERFACES=\"{{ dhcpd_interfaces }}\""
+    regexp: "^INTERFACES="
+  notify: Restart isc-dhcp-server
+
 - name: Start the dhcp server
   service: name=isc-dhcp-server state=started enabled=yes