===================================================================
RCS file: /cvs/texi2mdoc/main.c,v
retrieving revision 1.48
retrieving revision 1.49
diff -u -p -r1.48 -r1.49
--- texi2mdoc/main.c	2015/02/25 15:15:18	1.48
+++ texi2mdoc/main.c	2015/02/25 15:50:56	1.49
@@ -1,4 +1,4 @@
-/*	$Id: main.c,v 1.48 2015/02/25 15:15:18 kristaps Exp $ */
+/*	$Id: main.c,v 1.49 2015/02/25 15:50:56 kristaps Exp $ */
 /*
  * Copyright (c) 2015 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -990,7 +990,7 @@ doaccent(struct texi *p, enum texicmd cmd, size_t *pos
 	if ('{' == BUF(p)[*pos]) {
 		brace = 1;
 		advance(p, pos);
-	} else if (isalpha(texitoks[cmd].tok[0])) 
+	} else if (isalpha((unsigned char)texitoks[cmd].tok[0])) 
 		while (*pos < BUFSZ(p) && isws(BUF(p)[*pos]))
 			advance(p, pos);
 
@@ -1312,7 +1312,7 @@ dosymbol(struct texi *p, enum texicmd cmd, size_t *pos
 	}
 
 	/* Alphabetic commands have braces we ignore. */
-	if (isalpha(texitoks[cmd].tok[0]))
+	if (isalpha((unsigned char)texitoks[cmd].tok[0]))
 		doignbracket(p, cmd, pos);
 }
 
@@ -1608,7 +1608,7 @@ dotop(struct texi *p, enum texicmd cmd, size_t *pos)
 	teximacroclose(p);
 	teximacroopen(p, "Dt");
 	for (cp = p->title; '\0' != *cp; cp++)
-		texiputchar(p, toupper(*cp));
+		texiputchar(p, toupper((unsigned int)*cp));
 	texiputchars(p, " 7");
 	teximacroclose(p);
 	teximacro(p, "Os");