diff --git a/fedora-atomic.ks b/fedora-atomic.ks
index a61f78c..ebc1994 100644
--- a/fedora-atomic.ks
+++ b/fedora-atomic.ks
@@ -61,8 +61,10 @@ passwd -l root
 cp /etc/skel/.bash* /var/roothome
 
 # Configure docker-storage-setup to resize the partition table on boot
-# https://github.com/projectatomic/docker-storage-setup/pull/25
+# and extend the root filesystem to fill it.
+# https://pagure.io/atomic-wg/issue/343
 echo 'GROWPART=true' >> /etc/sysconfig/docker-storage-setup
+echo 'ROOT_SIZE=+100%FREE' >> /etc/sysconfig/docker-storage-setup
 
 echo -n "Getty fixes"
 # although we want console output going to the serial console, we don't