diff --git a/wiki/manifests/init.pp b/wiki/manifests/init.pp
index 6182280..8fbf9df 100644
--- a/wiki/manifests/init.pp
+++ b/wiki/manifests/init.pp
@@ -2,15 +2,17 @@
 #
 class wiki::moin {
 
-    if !$moin_package {
-        if $moin_package_latest {
-            $moin_package = $moin_package_latest
+    if ! $moin_package {
+        if $::moin_package_latest {
+            $moin_package = $::moin_package_latest
         } else {
             fail("Must define \$moin_package or \$moin_package_latest")
         }
     }
 
-    $moin_patch = regsubst($moin_package, '\.tar\.gz', '.patch')
+    if ! $moin_patch {
+        $moin_patch = regsubst($moin_package, '\.tar\.gz', '.patch')
+    }
 
     file { "/usr/local/src/moin.tar.gz":
         ensure => present,