diff --git a/overlay/usr/lib/systemd/system/systemd-tmpfiles-setup.service.d/force-subvol.conf b/overlay/usr/lib/systemd/system/systemd-tmpfiles-setup.service.d/force-subvol.conf
new file mode 100644
index 0000000..0aba01f
--- /dev/null
+++ b/overlay/usr/lib/systemd/system/systemd-tmpfiles-setup.service.d/force-subvol.conf
@@ -0,0 +1,2 @@
+[Service]
+Environment=SYSTEMD_TMPFILES_FORCE_SUBVOL=1