Calling a function via dblink in a PL/SQL program

I tried the following in my PL/SQL code:
his_schema.his_function(argument1, argument2)@hisplace
I got an error from the PL/SQL compiler for that one. I am trying to call a function that has been written in another database via a dblink (that has been created; I can use the link from my SQL prompt).
Of course, so far I have only done select on tables using dblink. This is the first time I am trying a function (and of course, from inside a PL/SQL program).
Any pointers would be appreciated.
Thanks,
Srini

The syntax is
rc := his_schema.his_function@hisplace(argument1, argument2);

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