--- ray/src/common/urand.c	1991/05/21 11:01:00	1.3
+++ ray/src/common/urand.c	1991/11/12 16:55:47	2.1
@@ -5,7 +5,7 @@ static char SCCSid[] = "$SunId$ LBL";
 #endif
 
 /*
- * Uncorrelated (anticorrelated) random function
+ * Anticorrelated random function due to Christophe Schlick
  */
 
 #include  "random.h"
@@ -53,7 +53,7 @@ register int  *d;
 register int  n;
 {
 	static int  tab[8] = {13623,353,1637,5831,2314,3887,5832,8737};
-	register unsigned  hval;
+	register int  hval;
 
 	hval = 0;
 	while (n-- > 0)