diff --git a/ChangeLog b/ChangeLog
index 50a22533a4..f3dc2a1bcd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Aug 31 04:27:04 2008  Tanaka Akira  <akr@fsij.org>
+
+	* transcode.c (econv_putback): renamed from econv_primitive_putback.
+
 Sun Aug 31 04:22:51 2008  Tanaka Akira  <akr@fsij.org>
 
 	* transcode.c (econv_insert_output): renamed from
diff --git a/test/ruby/test_econv.rb b/test/ruby/test_econv.rb
index 302a3e3c48..48b22fc270 100644
--- a/test/ruby/test_econv.rb
+++ b/test/ruby/test_econv.rb
@@ -478,7 +478,7 @@ class TestEncodingConverter < Test::Unit::TestCase
     ret = ec.primitive_convert(src="abc\xa1def", dst="", nil, 10)
     assert_equal(:invalid_byte_sequence, ret)
     assert_equal(["abc", "ef"], [dst, src])
-    src = ec.primitive_putback(nil) + src
+    src = ec.putback(nil) + src
     assert_equal(["abc", "def"], [dst, src])
     ret = ec.primitive_convert(src, dst, nil, 10)
     assert_equal(:finished, ret)
diff --git a/transcode.c b/transcode.c
index d6fc3d4a39..88ccc9b042 100644
--- a/transcode.c
+++ b/transcode.c
@@ -2727,7 +2727,7 @@ econv_insert_output(VALUE self, VALUE string)
 }
 
 static VALUE
-econv_primitive_putback(VALUE self, VALUE max)
+econv_putback(VALUE self, VALUE max)
 {
     rb_econv_t *ec = check_econv(self);
     int n;
@@ -2834,7 +2834,7 @@ Init_transcode(void)
     rb_define_method(rb_cEncodingConverter, "finish", econv_finish, 0);
     rb_define_method(rb_cEncodingConverter, "primitive_errinfo", econv_primitive_errinfo, 0);
     rb_define_method(rb_cEncodingConverter, "insert_output", econv_insert_output, 1);
-    rb_define_method(rb_cEncodingConverter, "primitive_putback", econv_primitive_putback, 1);
+    rb_define_method(rb_cEncodingConverter, "putback", econv_putback, 1);
     rb_define_const(rb_cEncodingConverter, "INVALID_MASK", INT2FIX(ECONV_INVALID_MASK));
     rb_define_const(rb_cEncodingConverter, "INVALID_IGNORE", INT2FIX(ECONV_INVALID_IGNORE));
     rb_define_const(rb_cEncodingConverter, "INVALID_REPLACE", INT2FIX(ECONV_INVALID_REPLACE));