diff --git a/api/v1/announcements/PKPAnnouncementHandler.php b/api/v1/announcements/PKPAnnouncementHandler.php
index 7e835274545..b4aa58f7578 100644
--- a/api/v1/announcements/PKPAnnouncementHandler.php
+++ b/api/v1/announcements/PKPAnnouncementHandler.php
@@ -324,13 +324,7 @@ protected function getContextId(): int
      */
     protected function getSiteRoleAssignments(array $roleAssignments): array
     {
-        $roleIds = array_keys($roleAssignments);
-        foreach ($roleIds as $roleId) {
-            if ($roleId !== Role::ROLE_ID_SITE_ADMIN) {
-                unset($roleAssignments[$roleId]);
-            }
-        }
-        return $roleAssignments;
+        return array_filter($roleAssignments, fn($key) => $key == Role::ROLE_ID_SITE_ADMIN, ARRAY_FILTER_USE_KEY);
     }
 
     /**