diff --git a/api/onnx_web/diffusers/pipelines/upscale.py b/api/onnx_web/diffusers/pipelines/upscale.py
index ff571f83..fc0e477b 100644
--- a/api/onnx_web/diffusers/pipelines/upscale.py
+++ b/api/onnx_web/diffusers/pipelines/upscale.py
@@ -51,9 +51,15 @@ def preprocess(image):
 
 
 class FakeConfig:
+    block_out_channels: List[int]
     scaling_factor: float
 
     def __init__(self) -> None:
+        self.block_out_channels = [
+            128,
+            256,
+            512
+        ]
         self.scaling_factor = 0.08333