diff --git a/Makefile b/Makefile
index a343216..b8cb5c7 100644
--- a/Makefile
+++ b/Makefile
@@ -24,8 +24,8 @@
 CARAVEL_LITE?=1
 
 # PDK switch varient
-#export PDK?=sky130B
-export PDK?=gf180mcuC
+export PDK?=sky130B
+#export PDK?=gf180mcuC
 export PDKPATH?=$(PDK_ROOT)/$(PDK)