diff --git a/board/czechlight/common/post_build.sh b/board/czechlight/common/post_build.sh
new file mode 100755
index 0000000..28a1f8b
--- /dev/null
+++ b/board/czechlight/common/post_build.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -ex
+
+cd ${TARGET_DIR}
+rm -rf etc/network
+rm -f etc/resolv.conf
+rmdir media mnt opt var/www || true
+rm -f var/lib/misc
+rm -rf var/{cache,lock,log,run,spool,tmp}
diff --git a/configs/czechlight_beaglebone_defconfig b/configs/czechlight_beaglebone_defconfig
index 566dc95..47fb514 100644
--- a/configs/czechlight_beaglebone_defconfig
+++ b/configs/czechlight_beaglebone_defconfig
@@ -8,6 +8,7 @@
 BR2_TARGET_GENERIC_PASSWD_SHA256=y
 BR2_INIT_SYSTEMD=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttyO0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/post_build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/beaglebone/post-image.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y