diff --git a/ChangeLog b/ChangeLog
index 9fd8c09e50..db257eae9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 23 21:40:47 2006  K.Kosako  <sndgk393 AT ybb.ne.jp>
+
+	* re.c (rb_reg_regsub): prohibit \1, \2 ...\9 in replaced string
+          for named regex pattern.
+
 Thu Mar 23 21:06:23 2006  K.Kosako  <sndgk393 AT ybb.ne.jp>
 
 	* oniguruma.h: Version 4.0.2
diff --git a/re.c b/re.c
index e2b27bdbd6..29a84f3c5c 100644
--- a/re.c
+++ b/re.c
@@ -2055,9 +2055,14 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
 	uc = (unsigned char)*s++;
 	p = s;
 	switch (uc) {
-	  case '0': case '1': case '2': case '3': case '4':
+	  case '1': case '2': case '3': case '4':
 	  case '5': case '6': case '7': case '8': case '9':
-	    no = uc - '0';
+            if (onig_noname_group_capture_is_active(RREGEXP(regexp)->ptr)) {
+              no = uc - '0';
+            }
+            else {
+              continue;
+            }
 	    break;
 
           case 'k':
@@ -2083,6 +2088,7 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
             rb_str_buf_cat(val, s-2, 2);
             continue;
 
+          case '0':
 	  case '&':
 	    no = 0;
 	    break;