diff --git a/ChangeLog b/ChangeLog
index 0c6b57f9f6..06c0e089c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Oct 24 19:29:22 2008  URABE Shyouhei  <shyouhei@ruby-lang.org>
+
+	* string.c (rb_str_dump): do not use C++ comment.
+
 Fri Oct 24 19:16:36 2008  URABE Shyouhei  <shyouhei@ruby-lang.org>
 
 	* id.h (enum ruby_method_ids): ISO C forbids comma at end of
diff --git a/string.c b/string.c
index a960970a07..fa2781939b 100644
--- a/string.c
+++ b/string.c
@@ -4212,7 +4212,7 @@ rb_str_dump(VALUE str)
 	sprintf(q, ".force_encoding(\"%s\")", enc->name);
 	enc = rb_ascii8bit_encoding();
     }
-//    STR_SET_LEN(result, strlen(RSTRING_PTR(result)));
+    /* STR_SET_LEN(result, strlen(RSTRING_PTR(result))); */
     OBJ_INFECT(result, str);
     /* result from dump is ASCII */
     rb_enc_associate(result, enc);