diff --git a/ChangeLog b/ChangeLog
index 330a557a12..17e479a751 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 15 21:01:46 2008  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pty/pty.c (chfunc): make it static.
+
 Mon Dec 15 20:59:10 2008  Tanaka Akira  <akr@fsij.org>
 
 	* ext/pty/pty.c (child_info): add slavename.
diff --git a/ext/pty/pty.c b/ext/pty/pty.c
index cb147386a7..4b3ebb19a6 100644
--- a/ext/pty/pty.c
+++ b/ext/pty/pty.c
@@ -150,7 +150,8 @@ struct child_info {
     VALUE *argv;
 };
 
-int chfunc(void *data)
+static int
+chfunc(void *data)
 {
     struct child_info *carg = data;
     int master = carg->master;