diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 1bbf877..7f23296 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -3446,9 +3446,8 @@
 
 lef
 
- masterslice pwell  substrate
- masterslice nwell  nwell
- masterslice poly   poly
+ masterslice pwell  pwell PWELL substrate
+ masterslice nwell  nwell NWELL
 
  routing li	li1 LI1 LI li