diff --git a/bench/json-bench.js b/bench/json-bench.js
index <HASH>..<HASH> 100644
--- a/bench/json-bench.js
+++ b/bench/json-bench.js
@@ -1,6 +1,8 @@
 
 /* global benchmark, competitor */
 
+"use strict" ;
+
 
 
 const json = require( '../lib/json.js' ) ;
@@ -449,5 +451,3 @@ benchmark( 'JSON stringify() then parse(), redundancy (objects that are in multi
 	} ) ;
 } ) ;
 
-
-
missing 'use strict' in benchmark file