diff --git a/ChangeLog b/ChangeLog
index 54ba755f26..710a6579fa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Mar 23 21:18:30 2009  Akinori MUSHA  <knu@iDaemons.org>
+
+	* ext/stringio/stringio.c (StringIO#ungetbyte): New method
+	  backported from 1.9.
+
 Mon Mar 23 21:16:21 2009  Akinori MUSHA  <knu@iDaemons.org>
 
 	* process.c: Stick with the K&R style in 1.8.
diff --git a/NEWS b/NEWS
index f5f142202b..13771cdbe0 100644
--- a/NEWS
+++ b/NEWS
@@ -136,6 +136,12 @@ with all sufficient information, see the ChangeLog file.
 
     Return an enumerator if no block is given.
 
+* stringio
+
+  * StringIO#ungetbyte
+
+    Added as an alias to #ungetc.
+
 * rss
 
   * 0.2.4 -> 0.2.5
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 3ed7d6b1af..16a836454f 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -726,7 +726,8 @@ strio_each_byte(self)
 
 /*
  * call-seq:
- *   strio.getc   -> fixnum or nil
+ *   strio.getbyte -> fixnum or nil
+ *   strio.getc    -> fixnum or nil
  *
  * See IO#getc.
  */
@@ -765,9 +766,10 @@ strio_extend(ptr, pos, len)
 
 /*
  * call-seq:
- *   strio.ungetc(integer)   -> nil
+ *   strio.ungetbyte(integer) -> nil
+ *   strio.ungetc(integer)    -> nil
  *
- * Pushes back one character (passed as a parameter) onto *strio*
+ * Pushes back one byte (passed as a parameter) onto *strio*
  * such that a subsequent buffered read will return it.  Pushing back 
  * behind the beginning of the buffer string is not possible.  Nothing
  * will be done if such an attempt is made.
@@ -1356,6 +1358,7 @@ Init_stringio()
     rb_define_method(StringIO, "getc", strio_getc, 0);
     rb_define_method(StringIO, "getbyte", strio_getc, 0);
     rb_define_method(StringIO, "ungetc", strio_ungetc, 1);
+    rb_define_method(StringIO, "ungetbyte", strio_ungetc, 1);
     rb_define_method(StringIO, "readchar", strio_readchar, 0);
     rb_define_method(StringIO, "readbyte", strio_readchar, 0);
     rb_define_method(StringIO, "gets", strio_gets, -1);