diff --git a/install/turris-omnia.mk b/install/turris-omnia.mk
new file mode 100644
index 0000000..d66a025
--- /dev/null
+++ b/install/turris-omnia.mk
@@ -0,0 +1,3 @@
+install-turris-omnia-uci-defaults:
+	mkdir -p files/etc/uci-defaults
+	cp misc/turris/omnia/uci-defaults/* files/etc/uci-defaults/
\ No newline at end of file
diff --git a/misc/turris/omnia/uci-defaults/99-resize-disk.sh b/misc/turris/omnia/uci-defaults/99-resize-disk.sh
new file mode 100644
index 0000000..10dc924
--- /dev/null
+++ b/misc/turris/omnia/uci-defaults/99-resize-disk.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -eo pipefail
+
+DISK=/dev/mmcblk0
+PARTITION="${DISK}p2"
+
+parted -s -a opt "$DISK" "resizepart 2 100%"
+
+FS_SIZE="$(unsquashfs -s "$PARTITION" | grep -o 'Filesystem size [0-9]* bytes' | grep -o '[0-9][0-9]*')"
+FS_OFFSET="$(expr '(' "$FS_SIZE" + 65535 ')' / 65536 '*' 65536)"
+LOOP_DEVICE="$(losetup -f --show -o "$FS_OFFSET" "$PARTITION")"
+
+e2fsck -fy "$LOOP_DEVICE"
+resize2fs "$LOOP_DEVICE"
diff --git a/targets/turris.mk b/targets/turris.mk
index 9a9e9c3..bff3167 100644
--- a/targets/turris.mk
+++ b/targets/turris.mk
@@ -4,7 +4,8 @@ turris: omnia
 
 omnia:
 	$(MAKE) \
-		ADDITIONAL_INSTALL="" \
+		ADDITIONAL_INSTALL="install-turris-omnia-uci-defaults" \
+		ADDITIONAL_OPENWRT_PACKAGES="losetup squashfs-tools-unsquashfs resize2fs e2fsprogs parted" \
 		OPENWRT_TARGET="mvebu/cortexa9" \
 		EMISSARY_ARCH="armv7" \
 		OPENWRT_PROFILE="cznic_turris-omnia" \