diff --git a/nodetype_access.module b/nodetype_access.module
index cde56ec..466f583 100644
--- a/nodetype_access.module
+++ b/nodetype_access.module
@@ -44,7 +44,7 @@ function nodetype_access_get_permission($nodetype) {
  * Get all permissions (sanitized) keyed by nodetype
  */
 function nodetype_access_get_permissions() {
-  $permission_keys = &drupal_static(__FUNCTION__);
+  $permission_keys = &drupal_static(__FUNCTION__, array());
   if(!isset($permission_keys)) {
     foreach(node_type_get_types() as $nodetype => $info) {
       $nodetype = check_plain($nodetype);