diff --git a/py/substep_sampling.py b/py/substep_sampling.py
index b2c8404..745fb65 100644
--- a/py/substep_sampling.py
+++ b/py/substep_sampling.py
@@ -199,7 +199,7 @@ class SamplerState:
         if preview_mode == "cond":
             preview = fallback(hi.denoised_cond, hi.denoised)
         elif preview_mode == "uncond":
-            preview = fallback(hi.uncond, hi.denoised)
+            preview = fallback(hi.denoised_uncond, hi.denoised)
         elif preview_mode == "raw":
             preview = hi.x
         else: