===================================================================
RCS file: /cvs/mandoc/mansearch.c,v
retrieving revision 1.70
retrieving revision 1.71
diff -u -p -r1.70 -r1.71
--- mandoc/mansearch.c	2017/04/17 20:05:08	1.70
+++ mandoc/mansearch.c	2017/04/18 13:57:56	1.71
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mansearch.c,v 1.70 2017/04/17 20:05:08 schwarze Exp $ */
+/*	$OpenBSD: mansearch.c,v 1.71 2017/04/18 13:57:56 schwarze Exp $ */
 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -516,6 +516,8 @@ buildoutput(size_t im, struct dbm_page *page)
 		output = mandoc_malloc(sz);
 		i = 0;
 		lstcat(output, &i, input, " # ");
+		output[i++] = '\0';
+		assert(i == sz);
 		return output;
 	}