diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 8757bd4..acfe41e 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -1020,6 +1020,7 @@
  	grow 	345
  	shrink 	345
 	and-not hvntm_block
+	mask-hints HVNTM
 	calma 125 20
 
 #----------------------------------------------------------------