diff --git a/roles/1-prep/templates/iiab-expand-rootfs.service b/roles/1-prep/templates/iiab-expand-rootfs.service
index 89e42f2ab..1d29e4b90 100644
--- a/roles/1-prep/templates/iiab-expand-rootfs.service
+++ b/roles/1-prep/templates/iiab-expand-rootfs.service
@@ -8,6 +8,7 @@ Before=dphys-swapfile.service
 Environment=TERM=linux
 Type=oneshot
 ExecStart=/usr/sbin/iiab-expand-rootfs
+TimeoutSec=infinity
 # "Standard output type syslog is obsolete"
 # StandardError=syslog
 # WHEREAS StandardError=journal is the default, per https://www.freedesktop.org/software/systemd/man/systemd.exec.html#StandardOutput=