diff --git a/ldm/models/diffusion/ddpm.py b/ldm/models/diffusion/ddpm.py
index 4f71ba0..a7a74c2 100644
--- a/ldm/models/diffusion/ddpm.py
+++ b/ldm/models/diffusion/ddpm.py
@@ -1470,6 +1470,7 @@ def __init__(
         self,
         concat_keys=("mask", "masked_image"),
         masked_image_key="masked_image",
+        finetune_keys=None,
         *args,
         **kwargs,
     ):