diff --git a/system/Database/Forge.php b/system/Database/Forge.php
index cadde578085b..e2d5d477f64f 100644
--- a/system/Database/Forge.php
+++ b/system/Database/Forge.php
@@ -39,7 +39,7 @@ class Forge
     /**
      * List of keys.
      *
-     * @phpstan-var array{fields: string[], keyName: string}
+     * @phpstan-var array|array{fields: string[], keyName: string}
      * @var array
      */
     protected $keys = [];
@@ -54,7 +54,7 @@ class Forge
     /**
      * Primary keys.
      *
-     * @phpstan-var array{fields: string[], keyName: string}
+     * @phpstan-var array|array{fields: string[], keyName: string}
      * @var array
      */
     protected $primaryKeys = [];