exec XP_CMDSHELL cannot find store procedure problem

I run EXECsp_configure 'xp_cmdshell', 1

Message is"....change from 1 to 1 "

Then

I check master database.

No dbo.xp_cmdshell under store procedure.

How to fix it? I need run command

EXECXP_CMDSHELL 'Dir N:'

Thanks