diff --git a/examples/community/stable_diffusion_controlnet_reference.py b/examples/community/stable_diffusion_controlnet_reference.py
index b18f276640..358fc1c6dc 100644
--- a/examples/community/stable_diffusion_controlnet_reference.py
+++ b/examples/community/stable_diffusion_controlnet_reference.py
@@ -642,7 +642,9 @@ class StableDiffusionControlNetReferencePipeline(StableDiffusionControlNetPipeli
 
             return hidden_states
 
-        def hacked_UpBlock2D_forward(self, hidden_states, res_hidden_states_tuple, temb=None, upsample_size=None, *args, **kwargs):
+        def hacked_UpBlock2D_forward(
+            self, hidden_states, res_hidden_states_tuple, temb=None, upsample_size=None, *args, **kwargs
+        ):
             eps = 1e-6
             for i, resnet in enumerate(self.resnets):
                 # pop res hidden states