Index: ShellPkg/Application/Shell/Shell.c
===================================================================
--- ShellPkg/Application/Shell/Shell.c	(revision 15384)
+++ ShellPkg/Application/Shell/Shell.c	(working copy)
@@ -2481,7 +2481,7 @@
   //
   switch (Type = GetOperationType(FirstParameter)) {
     case   File_Sys_Change:
-      Status = ChangeMappedDrive(CleanOriginal);
+      Status = ChangeMappedDrive (FirstParameter);
       break;
     case   Internal_Command:
     case   Script_File_Name: