diff --git a/ChangeLog b/ChangeLog
index 34e00b1c29..66d3f7816c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Aug 30 14:06:50 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* proc.c (rb_obj_define_method): reverted.  [ruby-talk:266637]
+
 Thu Aug 30 13:49:25 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb: initialize $top_srcdir always.  [ruby-dev:31682]
diff --git a/proc.c b/proc.c
index d1e4436bdb..3b6d9a94f4 100644
--- a/proc.c
+++ b/proc.c
@@ -1,6 +1,6 @@
 /**********************************************************************
 
-  proc.c - Proc, Bindng, Env
+  proc.c - Proc, Binding, Env
 
   $Author$
   $Date$
@@ -148,7 +148,6 @@ binding_alloc(VALUE klass)
     rb_binding_t *bind;
     obj = Data_Make_Struct(klass, rb_binding_t,
 			   binding_mark, binding_free, bind);
-    MEMZERO(bind, rb_binding_t, 1);
     return obj;
 }
 
@@ -972,6 +971,14 @@ rb_mod_define_method(int argc, VALUE *argv, VALUE mod)
     return body;
 }
 
+static VALUE
+rb_obj_define_method(int argc, VALUE *argv, VALUE obj)
+{
+    VALUE klass = rb_singleton_class(obj);
+
+    return rb_mod_define_method(argc, argv, klass);
+}
+
 
 /*
  * MISSING: documentation
@@ -1495,6 +1502,9 @@ Init_Proc(void)
     /* Module#*_method */
     rb_define_method(rb_cModule, "instance_method", rb_mod_method, 1);
     rb_define_private_method(rb_cModule, "define_method", rb_mod_define_method, -1);
+
+    /* Kernel */
+    rb_define_method(rb_mKernel, "define_singleton_method", rb_obj_define_method, -1);
 }
 
 /*