diff --git a/CRM/Core/Permission/Base.php b/CRM/Core/Permission/Base.php
index 60ffbe3c9ed6..e7e5702507b4 100644
--- a/CRM/Core/Permission/Base.php
+++ b/CRM/Core/Permission/Base.php
@@ -398,10 +398,9 @@ public function getModulePermissions($module): array {
    * @return array
    *   Array of permissions, in the same format as CRM_Core_Permission::getCorePermissions().
    */
-  public function getAllModulePermissions($descriptions = FALSE, &$permissions): array {
-    $newPermissions = [];
-    CRM_Utils_Hook::permission($newPermissions, $permissions);
-    $permissions = array_merge($permissions, $newPermissions);
+  public function getAllModulePermissions($descriptions = FALSE): array {
+    $permissions = [];
+    CRM_Utils_Hook::permission($permissions);
 
     if ($descriptions) {
       foreach ($permissions as $permission => $label) {