diff --git a/sql/sql_string.h b/sql/sql_string.h
index 9328849bb55..234e8272b88 100644
--- a/sql/sql_string.h
+++ b/sql/sql_string.h
@@ -1,7 +1,7 @@
 #ifndef SQL_STRING_INCLUDED
 #define SQL_STRING_INCLUDED
 
-/* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -268,6 +268,7 @@ public:
       DBUG_ASSERT(!s.uses_buffer_owned_by(this));
       free();
       Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
+      str_charset=s.str_charset;
       alloced=0;
     }
     return *this;