diff --git a/modules/observer.py b/modules/observer.py
index bcdf5ba9..be956242 100644
--- a/modules/observer.py
+++ b/modules/observer.py
@@ -14,6 +14,7 @@ def generate(host):
 
     info['icmp_target'] = 'ping.sunet.se'
     info['dns_target'] = 'slashdot.org.'
+    info['interface'] = 'eth0'
 
     return {'observer': info}
 
diff --git a/modules/observer/templates/observer.default.erb b/modules/observer/templates/observer.default.erb
index 11867183..be4862e2 100644
--- a/modules/observer/templates/observer.default.erb
+++ b/modules/observer/templates/observer.default.erb
@@ -1,4 +1,4 @@
 # AUTOGENERATED BY PUPPET
 # All manual changes will be overwritten
 
-ARGS="-dns <%= @nameservers.join(',') -%> -icmp-targets <%= @icmp_target %> -qname <%= @dns_target %>"
+ARGS="-dns <%= @nameservers.join(',') -%> -icmp-targets <%= @icmp_target %> -qname <%= @dns_target %> -interface <%= @interface %>"