diff --git a/board/czechlight/clearfog/post_build.sh b/board/czechlight/clearfog/post_build.sh
new file mode 100755
index 0000000..e376fbe
--- /dev/null
+++ b/board/czechlight/clearfog/post_build.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -ex
+
+${BR2_EXTERNAL_CZECHLIGHT_PATH}/board/czechlight/clearfog/copy-boot-scr.sh
+
+${BR2_EXTERNAL_CZECHLIGHT_PATH}/board/czechlight/common/os-release.sh
+
+# enable about 250MB of ramfs for the journal log
+sed -i -n \
+	-e '/\s\/run\s/!p' \
+	-e '$a tmpfs /run tmpfs rw,nosuid,nodev,size=256000k,nr_inodes=819200,mode=755' \
+	${TARGET_DIR}/etc/fstab
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 3ea93a5..519d2a0 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -20,7 +20,7 @@
 # BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW is not set
 BR2_ROOTFS_USERS_TABLES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/users"
 BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/overlay/ $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/overlay/"
-BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/copy-boot-scr.sh $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/os-release.sh"
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/post_build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh ${BR2_EXTERNAL_CZECHLIGHT_PATH}/board/czechlight/clearfog/usb-flash-genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/genimage.cfg"
 BR2_LINUX_KERNEL=y