diff --git a/phpBB/includes/acp/acp_users.php b/phpBB/includes/acp/acp_users.php
index 3747282f1e..40ab548a31 100644
--- a/phpBB/includes/acp/acp_users.php
+++ b/phpBB/includes/acp/acp_users.php
@@ -120,7 +120,7 @@ class acp_users
 			WHERE module_basename = 'users'
 				AND module_enabled = 1
 				AND module_class = 'acp'
-			GROUP BY module_mode
+			GROUP BY module_mode, module_auth
 			ORDER BY left_id";
 		$result = $db->sql_query($sql);