diff --git a/ldm_patched/contrib/external_model_downscale.py b/ldm_patched/contrib/external_model_downscale.py
index 58a01d55..8a3d67cd 100644
--- a/ldm_patched/contrib/external_model_downscale.py
+++ b/ldm_patched/contrib/external_model_downscale.py
@@ -24,8 +24,8 @@ class PatchModelAddDownscale:
     CATEGORY = "_for_testing"
 
     def patch(self, model, block_number, downscale_factor, start_percent, end_percent, downscale_after_skip, downscale_method, upscale_method):
-        sigma_start = model.model.model_sampling.percent_to_sigma(start_percent)
-        sigma_end = model.model.model_sampling.percent_to_sigma(end_percent)
+        sigma_start = model.model.predictor.percent_to_sigma(start_percent)
+        sigma_end = model.model.predictor.percent_to_sigma(end_percent)
 
         def input_block_patch(h, transformer_options):
             if transformer_options["block"][1] == block_number: