diff --git a/live-build/ubuntu-cpc/hooks/030-root-tarball.binary b/live-build/ubuntu-cpc/hooks/030-root-tarball.binary
index 8fde069f..fd818595 100755
--- a/live-build/ubuntu-cpc/hooks/030-root-tarball.binary
+++ b/live-build/ubuntu-cpc/hooks/030-root-tarball.binary
@@ -24,4 +24,5 @@ chroot binary/boot/filesystem.dir dpkg-divert --remove --local --rename /usr/sbi
 mv resolv.conf.tmp "binary/boot/filesystem.dir/etc/resolv.conf"
 umount "binary/boot/filesystem.dir/proc"
 umount "binary/boot/filesystem.dir/sys"
+umount "binary/boot/filesystem.dir/dev/pts"
 umount "binary/boot/filesystem.dir/dev"