diff --git a/openpower/configs/openpower_mambo_defconfig b/openpower/configs/openpower_mambo_defconfig
index b921130..fef2c26 100644
--- a/openpower/configs/openpower_mambo_defconfig
+++ b/openpower/configs/openpower_mambo_defconfig
@@ -29,6 +29,7 @@
 BR2_TARGET_GENERIC_GETTY_PORT="hvc0"
 BR2_ROOTFS_OVERLAY="../openpower/overlay"
 BR2_ROOTFS_DEVICE_TABLE="../openpower/device_table.txt"
+BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_VERSION="4.2"
 BR2_KERNEL_HEADERS_4_2=y