diff --git a/rootfs-overlay/arm/etc/part-expand.sh b/rootfs-overlay/arm/etc/part-expand.sh
new file mode 100755
index 0000000..82aa8b8
--- /dev/null
+++ b/rootfs-overlay/arm/etc/part-expand.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+# This should resize the sdcard to its full capacity.
+
+[ -f /etc/part-expanded ] && exit 0
+
+cat <<EOF | fdisk /dev/mmcblk0
+d
+2
+n
+p
+2
+
+
+Y
+w
+EOF
+
+partprobe
+
+mount /dev/mmcblk0p2 /mnt
+btrfs fi re max /mnt
+umount /mnt
+
+echo yes > /etc/part-expanded
diff --git a/rootfs-overlay/common/etc/rc.local b/rootfs-overlay/common/etc/rc.local
index 3533822..4f5e2d4 100755
--- a/rootfs-overlay/common/etc/rc.local
+++ b/rootfs-overlay/common/etc/rc.local
@@ -2,6 +2,7 @@
 # rc.local for base images
 
 [ -f /etc/ssh/ssh_host_rsa_key.pub ] || ssh-keygen -A
+[ -f /etc/part-expand.sh ] || /etc/part-expand.sh
 
 netdata