diff --git a/includes/defaults.inc.php b/includes/defaults.inc.php
index dc446379a3..5f9d5ca3c7 100644
--- a/includes/defaults.inc.php
+++ b/includes/defaults.inc.php
@@ -347,7 +347,7 @@ $config['auth_ldap_groups']['support']['level'] = 1;
 $config['astext'][65333] = "Cymru Bogon Feed";
 
 ### What should we warn about?
-$config['warn']['ifdown'] = false;
+$config['warn']['ifdown'] = true;
 
 ## List of poller modules. Need to be in the array to be
 ## considered for execution.