--- ray/src/rt/func.c	1993/03/08 12:37:23	2.8
+++ ray/src/rt/func.c	1993/05/25 10:30:16	2.9
@@ -166,7 +166,7 @@ setfunc(m, r)			/* set channels for function call */
 OBJREC  *m;
 register RAY  *r;
 {
-	static long  lastrno = -1;
+	static unsigned long  lastrno = ~0;
 	register MFUNC  *f;
 					/* get function */
 	if ((f = (MFUNC *)m->os) == NULL)