diff --git a/vm/mikrotik-routeros.sh b/vm/mikrotik-routeros.sh
index 20fd1b929..6f37776ae 100644
--- a/vm/mikrotik-routeros.sh
+++ b/vm/mikrotik-routeros.sh
@@ -252,7 +252,7 @@ nfs | dir)
   DISK_IMPORT="-format qcow2"
   ;;
 btrfs | zfspool)
-  DISK_EXT=".raw"
+  DISK_EXT=""
   DISK_REF="$VMID/"
   DISK_FORMAT="subvol"
   DISK_IMPORT="-format raw"