diff --git a/ChangeLog b/ChangeLog
index 8b3a312d9..3f6388b5e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+20011025
+ - (bal) Use VDISABLE if _POSIX_VDISABLE is set in readpassphrase.c.  Patch
+   by todd@
+
 20011024
  - (bal) Should be 3.0p1 not 3.0p2.  Corrected version.h already.
  - (tim) configure.in -> configure.ac
@@ -6756,4 +6760,4 @@
  - Wrote replacements for strlcpy and mkdtemp
  - Released 1.0pre1
 
-$Id: ChangeLog,v 1.1616 2001/10/25 04:15:26 tim Exp $
+$Id: ChangeLog,v 1.1617 2001/10/25 15:02:35 mouring Exp $
diff --git a/openbsd-compat/readpassphrase.c b/openbsd-compat/readpassphrase.c
index 8e5785520..fdef15809 100644
--- a/openbsd-compat/readpassphrase.c
+++ b/openbsd-compat/readpassphrase.c
@@ -42,6 +42,11 @@ static char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.5 2001/06/27 13:23:30 djm
 # define _T_FLUSH	(TCSAFLUSH)
 #endif
 
+/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
+#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
+#  define _POSIX_VDISABLE       VDISABLE
+#endif
+
 char *
 readpassphrase(prompt, buf, bufsiz, flags)
 	const char *prompt;