===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/mandoc/roff.c,v
retrieving revision 1.115
retrieving revision 1.116
diff -u -r1.115 -r1.116
--- src/usr.bin/mandoc/roff.c	2014/12/16 23:44:16	1.115
+++ src/usr.bin/mandoc/roff.c	2014/12/18 17:43:07	1.116
@@ -1,4 +1,4 @@
-/*	$OpenBSD: roff.c,v 1.115 2014/12/16 23:44:16 schwarze Exp $ */
+/*	$OpenBSD: roff.c,v 1.116 2014/12/18 17:43:07 schwarze Exp $ */
 /*
  * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -1574,7 +1574,7 @@
 			*res *= operand2;
 			break;
 		case '/':
-			if (0 == operand2) {
+			if (operand2 == 0) {
 				mandoc_msg(MANDOCERR_DIVZERO,
 					r->parse, ln, *pos, v);
 				*res = 0;
@@ -1583,6 +1583,12 @@
 			*res /= operand2;
 			break;
 		case '%':
+			if (operand2 == 0) {
+				mandoc_msg(MANDOCERR_DIVZERO,
+					r->parse, ln, *pos, v);
+				*res = 0;
+				break;
+			}
 			*res %= operand2;
 			break;
 		case '<':