diff --git a/src/diffusers/models/unet_2d.py b/src/diffusers/models/unet_2d.py
index e4aea20d3a33..38e26422e2a7 100644
--- a/src/diffusers/models/unet_2d.py
+++ b/src/diffusers/models/unet_2d.py
@@ -293,7 +293,7 @@ def forward(
             emb = emb + class_emb
         elif self.class_embedding is None and class_labels is not None:
             raise ValueError("class_embedding needs to be initialized in order to use class conditioning")
-          
+
         # 2. pre-process
         skip_sample = sample
         sample = self.conv_in(sample)