diff --git a/xCAT-server/lib/xcat/plugins/windows.pm b/xCAT-server/lib/xcat/plugins/windows.pm
index 732938e12..8f957aacc 100644
--- a/xCAT-server/lib/xcat/plugins/windows.pm
+++ b/xCAT-server/lib/xcat/plugins/windows.pm
@@ -136,7 +136,7 @@ sub mkwinlinks {
 	link "$installroot/autoinst/$node.cmd","$installroot/autoinst/$uuid.cmd"; 
 	#sadly, UUID endiannes is contentious to this day, tolerate a likely mangling
 	#of the UUID
-        $uuid =~ s/^(..)(..)(..)(..)-(..)(..)-(..)(..)-/$4$3$2$1-$6$5-$8$7/;
+        $uuid =~ s/^(..)(..)(..)(..)-(..)(..)-(..)(..)-/$4$3$2$1-$6$5-$8$7-/;
 	link "$installroot/autoinst/$node.cmd","$installroot/autoinst/$uuid.cmd"; 
     }
 }