How to fix IP service name?

The IP service name for SSH has gone blank on one of my routers:

/ip service> print
Flags: X - disabled, I - invalid 
 #   NAME         PORT ADDRESS                                           CERTIFICATE      
 0   telnet         23
 1   ftp            21
 2   www            80
 3                  22
 4 X www-ssl       443                                                   none             
 5 X api          8728
 6   winbox       8291
 7   api-ssl      8729                                                   none

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Is there any way for me to fix this without netinstalling the router? It’s in active service. It doesn’t really affect operation, of course, but it creates false hits in file-comparison utilities, and I’d like to fix it.

As Emily Litella says, “Never mind.”

Apparently, this is a side-effect of not having the “security” package loaded.