check_multi escape whitespace

How do I escape whitespace in check_multi?

check_pdh counter=\\Terminaldienste\\Aktive\ Sitzungen warn=value>5

L        cli OK: OK: \Terminaldienste\Aktive Sitzungen = 1
L        cli  Performance data: '\Terminaldienste\Aktive Sitzungen_value'=1;5;0

check_multi command=check_pdh counter=\\Terminaldienste\\Aktive\ Sitzungen warn=value>5

L        cli Long message                                                                     
UNKNOWN: Invalid command line: unrecognised option 'counter=\Terminaldienste\Aktive Sitzungen'
help            Show help screen (this screen)                                                
help-pb Show help screen as a protocol buffer payload                                         
show-default    Show default values for a given command                                       
help-short      Show help screen (short format).                                              
command=        Commands to run (can be used multiple times)                                  
arguments=      Deprecated alias for command                                                  
separator=,     Separator between messages                                                    
prefix= Message prefix                                                                        
suffix= Message suffix

check_multi command="check_pdh counter=\\Terminaldienste\\Aktive\ Sitzungen warn=value>5"

L        cli UNKNOWN: Invalid option: Sitzungen