diff --git a/ChangeLog b/ChangeLog
index a1285799c4..81f3bf73ad 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 20:16:46 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* common.mk (EXTMK_ARGS): shouldn't use ``\"'' because cmd.exe eat
diff --git a/ext/pty/pty.c b/ext/pty/pty.c
index 089322967b..ce805544fb 100644
--- a/ext/pty/pty.c
+++ b/ext/pty/pty.c
@@ -192,7 +192,8 @@ struct child_info {
     VALUE *argv;
 };
 
-int chfunc(void *data)
+static int
+chfunc(void *data)
 {
     struct child_info *carg = data;
     int master = carg->master;