diff --git a/ChangeLog b/ChangeLog
index 85f860766e..b077ba57f6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Sep  9 22:39:08 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pathname/pathname.c (path_size): Pathname#size translated from
+	  pathname.rb.
+
 Thu Sep  9 22:34:48 2010  wanabe  <s.wanabe@gmail.com>
 
 	* compile.c (case_when_optimizable_literal): When float value can be
diff --git a/ext/pathname/lib/pathname.rb b/ext/pathname/lib/pathname.rb
index 8d220223fe..c5b8be97c8 100644
--- a/ext/pathname/lib/pathname.rb
+++ b/ext/pathname/lib/pathname.rb
@@ -486,9 +486,6 @@ end
 
 class Pathname    # * FileTest *
 
-  # See <tt>FileTest.size</tt>.
-  def size() FileTest.size(@path) end
-
   # See <tt>FileTest.size?</tt>.
   def size?() FileTest.size?(@path) end
 
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index 46d1f7371c..14a79f73e4 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -741,6 +741,15 @@ path_setgid_p(VALUE self)
     return rb_funcall(rb_mFileTest, rb_intern("setgid?"), 1, get_strpath(self));
 }
 
+/*
+ * See <tt>FileTest.size</tt>.
+ */
+static VALUE
+path_size(VALUE self)
+{
+    return rb_funcall(rb_mFileTest, rb_intern("size"), 1, get_strpath(self));
+}
+
 /*
  * == Pathname
  *
@@ -986,4 +995,5 @@ Init_pathname()
     rb_define_method(rb_cPathname, "readable_real?", path_readable_real_p, 0);
     rb_define_method(rb_cPathname, "setuid?", path_setuid_p, 0);
     rb_define_method(rb_cPathname, "setgid?", path_setgid_p, 0);
+    rb_define_method(rb_cPathname, "size", path_size, 0);
 }