diff --git a/utilities/img2img.py b/utilities/img2img.py
index 27129f5..4178e38 100644
--- a/utilities/img2img.py
+++ b/utilities/img2img.py
@@ -62,7 +62,7 @@ class Img2Img:
         if isinstance(reference_image, str):
             reference_image = (
                 base64_to_image(reference_image)
-                .thumbnail(config.get_width(), config.get_height())
+                .thumbnail((config.get_width(), config.get_height()))
                 .convert("RGB")
             )