diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index 4de9b109f4..0fb65533d5 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -3162,6 +3162,7 @@ function translate_level_to_role( $level ) {
 		case 1:
 			return 'contributor';
 		case 0:
+		default:
 			return 'subscriber';
 	}
 }