diff --git a/ChangeLog b/ChangeLog
index 711fbe040f..8088c380f2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Apr  1 00:17:35 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* rational.c: revert.
+
 Mon Mar 31 18:57:36 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* {bcc,win}32/Makefile.sub (config.h): define ssize_t.
diff --git a/rational.c b/rational.c
index 90b227faf5..7165e93232 100644
--- a/rational.c
+++ b/rational.c
@@ -1432,7 +1432,7 @@ string_to_r_strict(VALUE self)
   VALUE a = string_to_r_internal(self);
   if (NIL_P(RARRAY_PTR(a)[0]) || RSTRING_LEN(RARRAY_PTR(a)[1]) > 0) {
     VALUE s = f_inspect(self);
-    rb_raise(rb_eTypeError, "invalid value for Rational: %s",
+    rb_raise(rb_eArgError, "invalid value for Rational: %s",
 	     StringValuePtr(s));
   }
   return RARRAY_PTR(a)[0];