diff --git a/proxmox-file-restore/src/qemu_helper.rs b/proxmox-file-restore/src/qemu_helper.rs
index c49f80d9..12c8cabf 100644
--- a/proxmox-file-restore/src/qemu_helper.rs
+++ b/proxmox-file-restore/src/qemu_helper.rs
@@ -260,7 +260,7 @@ pub async fn start_vm(
         // NOTE: ZFS requires that the ARC can at least grow to the max transaction size of 64MB
         // also: setting any of min/max to zero will rather do the opposite of what one wants here
         &format!(
-            "{} panic=1 zfs_arc_min=16777216 zfs_arc_max=67108864 memhp_default_state=online_kernel",
+            "{} panic=1 zfs.zfs_arc_min=16777216 zfs.zfs_arc_max=67108864 memhp_default_state=online_kernel",
             if debug { "debug" } else { "quiet" }
         ),
         "-daemonize",