diff --git a/og.module b/og.module
index dac0ab7..629982a 100644
--- a/og.module
+++ b/og.module
@@ -3152,6 +3152,11 @@ function og_role_change_permissions($rid, array $permissions = array()) {
  */
 function og_role_grant_permissions($rid, array $permissions = array()) {
   $modules = array();
+
+  // We should to flush the static cache for the "og_get_permissions()"
+  // function, before we would try to get all "og" permissions.
+  drupal_static_reset('og_get_permissions');
+
   foreach (og_get_permissions() as $name => $value) {
     $modules[$name] = $value['module'];
   }