diff --git a/ChangeLog b/ChangeLog
index fff9e65c6b..fa7d56caf8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Sep 10 07:03:23 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pathname/pathname.c (path_size_p): Pathname#size? translated from
+	  pathname.rb.
+
 Fri Sep 10 02:15:29 2010  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/option.c (inspect_peercred): support OpenBSD-current.
diff --git a/ext/pathname/lib/pathname.rb b/ext/pathname/lib/pathname.rb
index c5b8be97c8..3879f5584e 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.sticky?</tt>.
   def sticky?() FileTest.sticky?(@path) end
 
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index 14a79f73e4..bea02ab6fe 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -750,6 +750,15 @@ path_size(VALUE self)
     return rb_funcall(rb_mFileTest, rb_intern("size"), 1, get_strpath(self));
 }
 
+/*
+ * See <tt>FileTest.size?</tt>.
+ */
+static VALUE
+path_size_p(VALUE self)
+{
+    return rb_funcall(rb_mFileTest, rb_intern("size?"), 1, get_strpath(self));
+}
+
 /*
  * == Pathname
  *
@@ -996,4 +1005,5 @@ Init_pathname()
     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);
+    rb_define_method(rb_cPathname, "size?", path_size_p, 0);
 }