diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index c583fd2c04..281aa68b86 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -3171,6 +3171,7 @@ function translate_level_to_role( $level ) {
 		case 1:
 			return 'contributor';
 		case 0:
+		default:
 			return 'subscriber';
 	}
 }