diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index c34d019..38d000f 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -483,6 +483,7 @@
 		-lib %l/latest/timing/*.lib \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			sort=custom/scripts/sort_pdkfiles.py \
+			options=custom/scripts/sky130_fd_io_import.tcl \
 		-verilog %l/latest/cells/*/*.*.v \
 		-verilog %l/latest/cells/*/*.v exclude=*.*.v \
 			compile-only filter=custom/scripts/inc_verilog.py \