diff --git a/ChangeLog b/ChangeLog
index d2d6862cb..c5ce2aed4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -43,6 +43,9 @@
    - jmc@cvs.openbsd.org 2009/08/19 04:56:03
      [sftp.1]
      ether -> either;
+   - dtucker@cvs.openbsd.org 2009/08/20 23:54:28
+     [mux.c]
+     subsystem_flag is defined in ssh.c so it's extern; ok djm
 
 20091002
  - (djm) [Makefile.in] Mention readconf.o in ssh-keysign's make deps.
diff --git a/mux.c b/mux.c
index 79f83768b..fac43a71f 100644
--- a/mux.c
+++ b/mux.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mux.c,v 1.7 2008/06/13 17:21:20 dtucker Exp $ */
+/* $OpenBSD: mux.c,v 1.8 2009/08/20 23:54:28 dtucker Exp $ */
 /*
  * Copyright (c) 2002-2008 Damien Miller <djm@openbsd.org>
  *
@@ -85,7 +85,7 @@ extern int tty_flag;
 extern Options options;
 extern int stdin_null_flag;
 extern char *host;
-int subsystem_flag;
+extern int subsystem_flag;
 extern Buffer command;
 
 /* Context for session open confirmation callback */