diff --git a/ChangeLog b/ChangeLog
index 24a2d3382e..34933ef55e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Jul 26 14:14:12 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
+
+	* ext/stringio/stringio.c: includes Enumerable as well as IO.
+	  [ruby-talk:77058]
+
 Sat Jul 26 07:00:53 2003  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
 
 	* lib/erb.rb: fix % line.
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 4dff4e1ebf..366b337a4e 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -896,6 +896,8 @@ void
 Init_stringio()
 {
     VALUE StringIO = rb_define_class("StringIO", rb_cData);
+
+    rb_include_module(StringIO, rb_mEnumerable);
     rb_define_alloc_func(StringIO, strio_s_allocate);
     rb_define_singleton_method(StringIO, "open", strio_s_open, -1);
     rb_define_method(StringIO, "initialize", strio_initialize, -1);