diff --git a/Makefile b/Makefile
index b09e331..2fe7ee2 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ mnt-system:
 	mount --make-rslave $(MNTDIR)/run
 
 umnt:
-	umount -R $(DRIVE)
+	umount -R $(MNTDIR)
 
 base:
 	$(call vinstall,base-system)