diff --git a/lib/libc/gen/vis.c b/lib/libc/gen/vis.c
index d8ad60d479b1..aa19fdfa64a5 100644
--- a/lib/libc/gen/vis.c
+++ b/lib/libc/gen/vis.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: vis.c,v 1.13 1999/09/20 04:39:07 lukem Exp $	*/
+/*	$NetBSD: vis.c,v 1.14 1999/11/17 15:52:13 wennmach Exp $	*/
 
 /*-
  * Copyright (c) 1989, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)vis.c	8.1 (Berkeley) 7/19/93";
 #else
-__RCSID("$NetBSD: vis.c,v 1.13 1999/09/20 04:39:07 lukem Exp $");
+__RCSID("$NetBSD: vis.c,v 1.14 1999/11/17 15:52:13 wennmach Exp $");
 #endif
 #endif /* LIBC_SCCS and not lint */
 
@@ -133,8 +133,8 @@ vis(dst, c, flag, nextc)
 	}
 	if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {	
 		*dst++ = '\\';
-		*dst++ = ((((u_int32_t)c) >> 6) & 07) + '0';
-		*dst++ = ((((u_int32_t)c) >> 3) & 07) + '0';
+		*dst++ = (u_char)((((u_int32_t)(u_char)c) >> 6) & 03) + '0';
+		*dst++ = (u_char)((((u_int32_t)(u_char)c) >> 3) & 07) + '0';
 		*dst++ = (((u_char)c) & 07) + '0';
 		goto done;
 	}