diff --git a/manifests/target.pp b/manifests/target.pp
index 2de3116..65c606e 100644
--- a/manifests/target.pp
+++ b/manifests/target.pp
@@ -13,10 +13,10 @@
   # This MUST be the same of $::nagios::customconfigdir
   # HINT: Do not mess with default path names...
 
-  $customconfigdir = $::nagios_customconfigdir ? {
-    ''      => '/etc/nagios/auto.d',
-    undef   => '/etc/nagios/auto.d',
-    default => $::nagios_customconfigdir,
+  $customconfigdir = $::operatingsystem ? {
+    /(?i:RedHat|Centos|Scientific|Fedora|Amazon|Linux)/ => '/etc/nagios/auto.d',
+    /(?i:Debian|Ubuntu|Mint)/                           => '/etc/nagios3/auto.d',
+    default                                             => $::nagios_customconfigdir,
   }
 
   # TODO: Find a smarter solution that doesn't requre TopScope Variables