diff --git a/comfy/ops.py b/comfy/ops.py
index e11d46f9c..d76138c92 100644
--- a/comfy/ops.py
+++ b/comfy/ops.py
@@ -21,6 +21,7 @@ import comfy.model_management
 
 
 def cast_to(weight, dtype=None, device=None, non_blocking=False):
+    non_blocking = False
     return weight.to(device=device, dtype=dtype, non_blocking=non_blocking)
 
 def cast_to_input(weight, input, non_blocking=False):