diff --git a/ChangeLog b/ChangeLog
index aa6e87d804..38e5e2d34f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Mar 11 17:31:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* transcode.c (str_transcode0): confirm the code range.
+
 Thu Mar 11 12:14:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* missing/signbit.c: added.
diff --git a/transcode.c b/transcode.c
index 9d6a886850..dba26a2394 100644
--- a/transcode.c
+++ b/transcode.c
@@ -2590,7 +2590,7 @@ str_transcode0(int argc, VALUE *argv, VALUE *self, int ecflags, VALUE ecopts)
             return NIL_P(arg2) ? -1 : dencidx;
         }
         if (senc && denc && rb_enc_asciicompat(senc) && rb_enc_asciicompat(denc)) {
-            if (ENC_CODERANGE(str) == ENC_CODERANGE_7BIT) {
+            if (rb_enc_str_coderange(str) == ENC_CODERANGE_7BIT) {
                 return dencidx;
             }
         }