diff --git a/app/controllers/api/storage.php b/app/controllers/api/storage.php
index f4f00cbea..68edc774e 100644
--- a/app/controllers/api/storage.php
+++ b/app/controllers/api/storage.php
@@ -242,7 +242,7 @@ App::get('/v1/storage/files/:fileId/preview')
     ->param('fileId', '', new UID(), 'File unique ID')
     ->param('width', 0, new Range(0, 4000), 'Resize preview image width, Pass an integer between 0 to 4000.', true)
     ->param('height', 0, new Range(0, 4000), 'Resize preview image height, Pass an integer between 0 to 4000.', true)
-    ->param('gravity', Image::GRAVITY_CENTER, new WhiteList(Image::GRAVITY_CENTER, Image::GRAVITY_NORTH, Image::GRAVITY_NORTHWEST, Image::GRAVITY_NORTHEAST, Image::GRAVITY_WEST, Image::GRAVITY_EAST, Image::GRAVITY_SOUTHWEST, Image::GRAVITY_SOUTH, Image::GRAVITY_SOUTHEAST), 'Image crop gravity', true)
+    ->param('gravity', Image::GRAVITY_CENTER, new WhiteList([Image::GRAVITY_CENTER, Image::GRAVITY_NORTH, Image::GRAVITY_NORTHWEST, Image::GRAVITY_NORTHEAST, Image::GRAVITY_WEST, Image::GRAVITY_EAST, Image::GRAVITY_SOUTHWEST, Image::GRAVITY_SOUTH, Image::GRAVITY_SOUTHEAST]), 'Image crop gravity', true)
     ->param('quality', 100, new Range(0, 100), 'Preview image quality. Pass an integer between 0 to 100. Defaults to 100.', true)
     ->param('borderWidth', 0, new Range(0, 100), 'Preview image border in pixels. Pass an integer between 0 to 100. Defaults to 0.', true)
     ->param('borderColor', '', new HexColor(), 'Preview image border color. Use a valid HEX color, no # is needed for prefix.', true)