diff --git a/builder/templates/make-template.ml b/builder/templates/make-template.ml
index 8372dd68f..c8f87d76a 100755
--- a/builder/templates/make-template.ml
+++ b/builder/templates/make-template.ml
@@ -824,8 +824,8 @@ and make_virt_install_command os arch ks tmpname tmpout tmpefivars
 and print_virt_install_command chan vi =
   Array.iter (
     fun arg ->
-      if arg.[0] = '-' then fprintf chan "\\\n    %s " arg
-      else fprintf chan "%s " arg
+      if arg.[0] = '-' then fprintf chan "\\\n    %s " (quote arg)
+      else fprintf chan "%s " (quote arg)
   ) vi;
   fprintf chan "\n\n%!"