diff --git a/ChangeLog b/ChangeLog
index 2606aa3875..67b0fbce0c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jan 24 18:14:14 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* re.c (rb_reg_fixed_encoding_p): no need to treat ASCII-8BIT specially.
+
 Thu Jan 24 16:53:06 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* re.c (rb_reg_initialize): 7bit clean regexp should be US-ASCII.
diff --git a/re.c b/re.c
index 562c151c7c..dced068d98 100644
--- a/re.c
+++ b/re.c
@@ -931,7 +931,7 @@ rb_match_busy(VALUE match)
 static VALUE
 rb_reg_fixed_encoding_p(VALUE re)
 {
-    if (!ENCODING_IS_ASCII8BIT(re) || FL_TEST(re, KCODE_FIXED))
+    if (FL_TEST(re, KCODE_FIXED))
         return Qtrue;
     else
         return Qfalse;