diff --git a/Makefile b/Makefile
index 2e7ea7d5..92e9a902 100644
--- a/Makefile
+++ b/Makefile
@@ -368,6 +368,7 @@ $(LVS_GDS_BLOCKS): lvs-gds-% : ./gds/%.gds ./verilog/gl/%.v
 		select top cell;\
 		extract no all;\
 		extract do local;\
+		extract unique;\
 		extract;\
 		ext2spice lvs;\
 		ext2spice $*.ext;\