diff --git a/source/third_party/jsonspirit/json_spirit_writer_template.h b/source/third_party/jsonspirit/json_spirit_writer_template.h
index 6e6fe124d9..94292a67f1 100644
--- a/source/third_party/jsonspirit/json_spirit_writer_template.h
+++ b/source/third_party/jsonspirit/json_spirit_writer_template.h
@@ -34,8 +34,6 @@ namespace json_spirit
     template< class String_type >
     String_type non_printable_to_string( unsigned int c )
     {
-        typedef typename String_type::value_type Char_type;
-
         String_type result( 6, '\\' );
 
         result[1] = 'u';