diff --git a/includes/callback_node_access.inc b/includes/callback_node_access.inc
index 8bfab49..2db6eeb 100644
--- a/includes/callback_node_access.inc
+++ b/includes/callback_node_access.inc
@@ -38,17 +38,17 @@ class SearchApiAlterNodeAccess extends SearchApiAbstractAlterCallback {
    * {@inheritdoc}
    */
   public function alterItems(array &$items) {
-    static $account;
+    static $implements_node_grants;
 
-    if (!isset($account)) {
-      // Load the anonymous user.
-      $account = drupal_anonymous_user();
+    if (!isset($implements_node_grants)) {
+      // Check if there are any modules that implement hook_node_grants.
+      $implements_node_grants = count(module_implements('node_grants'));
     }
 
     foreach ($items as $id => $item) {
       $node = $this->getNode($item);
-      // Check whether all users have access to the node.
-      if (!node_access('view', $node, $account)) {
+      // Check implemented node_grants.
+      if ($implements_node_grants) {
         // Get node access grants.
         $result = db_query('SELECT * FROM {node_access} WHERE (nid = 0 OR nid = :nid) AND grant_view = 1', array(':nid' => $node->nid));
 
@@ -58,8 +58,7 @@ class SearchApiAlterNodeAccess extends SearchApiAbstractAlterCallback {
         }
       }
       else {
-        // Add the generic view grant if we are not using node access or the
-        // node is viewable by anonymous users.
+        // Add the generic view grant if we are not using node access.
         $items[$id]->search_api_access_node = array('node_access__all');
       }
     }