diff --git a/Makefile b/Makefile
index af079a2..0c2126d 100644
--- a/Makefile
+++ b/Makefile
@@ -36,8 +36,8 @@
 
 ifeq ($(PDK),sky130B)
 	SKYWATER_COMMIT=f70d8ca46961ff92719d8870a18a076370b85f6c
-	OPEN_PDKS_COMMIT?=0059588eebfc704681dc2368bd1d33d96281d10f
-	OPENLANE_TAG?=2022.10.20
+	export OPEN_PDKS_COMMIT?=0059588eebfc704681dc2368bd1d33d96281d10f
+	export OPENLANE_TAG?=2022.10.20
 	MPW_TAG ?= mpw-7d
 
 ifeq ($(CARAVEL_LITE),1)
@@ -56,7 +56,8 @@
 	CARAVEL_REPO := https://github.com/efabless/caravel-gf180mcu
 	CARAVEL_TAG := $(MPW_TAG)
 	#OPENLANE_TAG=ddfeab57e3e8769ea3d40dda12be0460e09bb6d9
-	OPENLANE_TAG?=2022.10.20
+	export OPEN_PDKS_COMMIT?=0059588eebfc704681dc2368bd1d33d96281d10f
+	export OPENLANE_TAG?=2022.10.20
 	MPW_TAG ?= gfmpw-0a
 
 endif