diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 3f4bb20..273596f 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -6134,6 +6134,13 @@
  device msubcircuit sky130_fd_pr__pnp_05v0 pnp pwell,space/w *pdiff a2=area
  device msubcircuit sky130_fd_pr__npn_11v0 npn dnwell *mvndiff space/w error a2=area
 
+ # Ignore the extended-drain FET geometry that forms part of the high-voltage
+ # bipolar devices.
+ device msubcircuit Ignore mvnfet *mvndiff,mvndiffres \
+	dnwell pwell,space/w error +npn,pnp l=l w=w
+ device msubcircuit Ignore mvpfet *mvpdiff,mvpdiffres \
+	pwell,space/w nwell error +npn,pnp l=l w=w
+
  # Extended drain devices (must appear before the regular devices)
  device msubcircuit sky130_fd_pr__nfet_20v0_nvt mvnnfet *mvndiff,mvndiffres \
 	dnwell pwell,space/w error l=l w=w