diff --git a/ChangeLog b/ChangeLog
index e14aeebc64..e1ad4bca07 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Sep  1 22:03:41 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pathname/pathname.c (path_grpowned_p): Pathname#grpowned?
+	  translated from pathname.rb.
+
 Wed Sep  1 17:39:02 2010  Ryan Davis  <ryand-ruby@zenspider.com>
 
 	* lib/minitest/*.rb: Imported minitest 1.7.1 r5835.
diff --git a/ext/pathname/lib/pathname.rb b/ext/pathname/lib/pathname.rb
index 3257ef0271..dceb327492 100644
--- a/ext/pathname/lib/pathname.rb
+++ b/ext/pathname/lib/pathname.rb
@@ -486,9 +486,6 @@ end
 
 class Pathname    # * FileTest *
 
-  # See <tt>FileTest.grpowned?</tt>.
-  def grpowned?() FileTest.grpowned?(@path) end
-
   # See <tt>FileTest.directory?</tt>.
   def directory?() FileTest.directory?(@path) end
 
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index c635201053..96b7970d8e 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -642,6 +642,15 @@ path_exist_p(VALUE self)
     return rb_funcall(rb_mFileTest, rb_intern("exist?"), 1, get_strpath(self));
 }
 
+/*
+ * See <tt>FileTest.grpowned?</tt>.
+ */
+static VALUE
+path_grpowned_p(VALUE self)
+{
+    return rb_funcall(rb_mFileTest, rb_intern("grpowned?"), 1, get_strpath(self));
+}
+
 /*
  * == Pathname
  *
@@ -876,4 +885,5 @@ Init_pathname()
     rb_define_method(rb_cPathname, "executable?", path_executable_p, 0);
     rb_define_method(rb_cPathname, "executable_real?", path_executable_real_p, 0);
     rb_define_method(rb_cPathname, "exist?", path_exist_p, 0);
+    rb_define_method(rb_cPathname, "grpowned?", path_grpowned_p, 0);
 }