diff --git a/AppTest.js b/AppTest.js
index cd74cfd..63c4bdf 100644
--- a/AppTest.js
+++ b/AppTest.js
@@ -17,7 +17,8 @@ const { InteractiveOptions } = require ('./dist/lib/index.js');
     { name: 'str', type: 'string', env: 'TEST_STR' },
     { name: 'bool', type: 'boolean', env: 'TEST_BOOL' },
     { name: 'num', type: 'number', env: 'TEST_NUM' },
-    { name: 'arr', type: 'array', env: 'TEST_ARR' }
+    { name: 'arr', type: 'array', env: 'TEST_ARR' },
+    { name: 'fld', type: 'folder', env: 'TEST_FOLDER' }
   ]);
   await reader.parse ();
   console.log (reader.serialize (true));
diff --git a/lib/Types/PathType.ts b/lib/Types/PathType.ts
index 1d02a8e..0530a78 100644
--- a/lib/Types/PathType.ts
+++ b/lib/Types/PathType.ts
@@ -13,6 +13,10 @@ export class PathType extends TypeValidation {
     return 'string';
   }
 
+  public get persistent_type (): 'string'|'number'|'boolean'|'array' {
+    return 'string';
+  }
+
   public async to_type (value: unknown): Promise<unknown> {
     if (typeof value !== 'string')
       throw new Error (`invalid type for ${this.option_type}`);