diff --git a/time/manifests/init.pp b/time/manifests/init.pp
index ba2c395..2e7d316 100644
--- a/time/manifests/init.pp
+++ b/time/manifests/init.pp
@@ -12,9 +12,18 @@ class time::server {
 
 # Set default timezone
 #
-# $timezone_set should point to a file under /usr/share/zoneinfo/
-# for example $timezone_set = "Europe/Helsinki".
+# === Global variables
+#
+#   $timezone_set:
+#       Time zone as defined under /usr/share/zoneinfo/,
+#       for example "Europe/Helsinki". Defaults to "UTC".
+#
 class time::zone {
+
+    if ! $timezone_set {
+        $timezone_set = "UTC"
+    }
+
     file { "/etc/localtime":
         ensure => link,
         target => "/usr/share/zoneinfo/${timezone_set}",
@@ -45,4 +54,5 @@ class time::zone {
             fail("time::zone not supported on ${::operatingsystem}")
         }
     }
+
 }