diff --git a/ChangeLog b/ChangeLog
index 4b361c4f0d..7b497826ae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Aug  7 09:31:48 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pathname/pathname.c (Init_pathname): fix number of arguments for
+	  Pathname#chown.
+
 Sat Aug  7 09:28:12 2010  Tanaka Akira  <akr@fsij.org>
 
 	* test/ruby/envutil.rb (assert_normal_exit): use assert.  fix
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index a32c1fdeca..d62cbdd83e 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -491,5 +491,5 @@ Init_pathname()
     rb_define_method(rb_cPathname, "mtime", path_mtime, 0);
     rb_define_method(rb_cPathname, "chmod", path_chmod, 1);
     rb_define_method(rb_cPathname, "lchmod", path_lchmod, 1);
-    rb_define_method(rb_cPathname, "chown", path_chown, 1);
+    rb_define_method(rb_cPathname, "chown", path_chown, 2);
 }