diff --git a/cuburn/genome/blend.py b/cuburn/genome/blend.py
index cd9ec7d..862abae 100644
--- a/cuburn/genome/blend.py
+++ b/cuburn/genome/blend.py
@@ -242,7 +242,7 @@ def padding_xform(xf, isfinal):
     if vars:
         n = float(len(vars))
         for k in vars:
-            vars[k]['weight'] /= n
+            vars[k]['weight'] = 1 / n
     else:
         vars['linear'] = dict(weight=1)