diff --git a/app/Http/Controllers/PublicController.php b/app/Http/Controllers/PublicController.php
index 3660487..b3d7c02 100644
--- a/app/Http/Controllers/PublicController.php
+++ b/app/Http/Controllers/PublicController.php
@@ -43,7 +43,7 @@ class PublicController extends BaseController
         if(!array_key_exists($sizeName, self::$size)) {
             abort(400, "Size not exists");
         }
-        $size = (int)$this->size[$sizeName];
+        $size = (int)self::$size[$sizeName];
 
         $image = Image::query()->where("id", "=", $image_id)->firstOrFail();
         $gallery = Gallery::query()->where("url", "=", $gallery_url)->firstOrFail();