diff --git a/src/diffusers/models/unets/unet_1d_blocks.py b/src/diffusers/models/unets/unet_1d_blocks.py
index 3c7c1cbecee9..8fc27e94c474 100644
--- a/src/diffusers/models/unets/unet_1d_blocks.py
+++ b/src/diffusers/models/unets/unet_1d_blocks.py
@@ -200,7 +200,7 @@ def __init__(
 
         self.upsample = None
         if add_upsample:
-            self.upsample = Downsample1D(out_channels, use_conv=True)
+            self.upsample = Upsample1D(out_channels, use_conv=True)
 
         self.downsample = None
         if add_downsample: