diff --git a/sysinst.sh b/sysinst.sh
index 28ee21a..94d3895 100644
--- a/sysinst.sh
+++ b/sysinst.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set euxo -pipefail
+mount /dev/disk/by-label/guix /mnt
+mount /dev/disk/by-label/EFI /mnt/boot/efi
 herd start cow-store /mnt
-guix pull -L.
-sed -i 's|/etc/config.scm|/mnt/etc/config.scm|g' ./config.scm
+guix pull -C./channels.scm
 guix system -L. init ./config.scm /mnt --substitute-urls="https://ci.guix.gnu.org https://bordeaux.guix.gnu.org https://substitutes.nonguix.org"