===================================================================
RCS file: /cvs/mandoc/main.c,v
retrieving revision 1.262
retrieving revision 1.263
diff -u -p -r1.262 -r1.263
--- mandoc/main.c	2016/01/08 02:53:13	1.262
+++ mandoc/main.c	2016/01/16 22:30:33	1.263
@@ -1,4 +1,4 @@
-/*	$Id: main.c,v 1.262 2016/01/08 02:53:13 schwarze Exp $ */
+/*	$Id: main.c,v 1.263 2016/01/16 22:30:33 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2012, 2014-2016 Ingo Schwarze <schwarze@openbsd.org>
@@ -720,7 +720,7 @@ parse(struct curparse *curp, int fd, const char *file)
 	/* Begin by parsing the file itself. */
 
 	assert(file);
-	assert(fd > 0);
+	assert(fd >= 0);
 
 	rctmp = mparse_readfd(curp->mp, fd, file);
 	if (fd != STDIN_FILENO)