diff --git a/benchmark.js b/benchmark.js
index f142b3c6..743b00c7 100644
--- a/benchmark.js
+++ b/benchmark.js
@@ -591,7 +591,7 @@
       result = (result || '').replace(/^\s+|\s+$/g, '');
 
       // Detect strings containing only the "use strict" directive.
-      return /^(?:\/\*+[\w\W]*?\*\/|\/\/.*?[\n\r\u2028\u2029]|\s)*(["'])use strict\1;?$/.test(result)
+      return /^(?:\/\*[\w\W]*?\*\/|\/\/.*?[\n\r\u2028\u2029]|\s)*(["'])use strict\1;?$/.test(result)
         ? ''
         : result;
     }