ILE cobol / C procedure call

I'm trying to compile a COBOL program that CALLs a C procedure and uses
the RETURNING clause, but I keep getting the following compile error:

---
 Message . . . . :   A CALL statement expected a return value from a
   program that does not return a value or visa versa.
---

So first of all, the C procedure is declared to return int.  But since I'm
compiling the COBOL into one module, compiling the C procedure into a
service program, and binding the modules later on...how is the COBOL
compiler supposed to know anything at all about whether or not my
C procedure returns a value?!?  Is there a COBOL section for defining such
things?

This is all undertaken as a workaround, btw, since I still haven't gotten
the RETURN-CODE special register to reflect my C return values.

Have a good weekend, everyone-

-Jared