diff --git a/lib/random/random.js b/lib/random/random.js
index 1519d62..ed6d5f0 100644
--- a/lib/random/random.js
+++ b/lib/random/random.js
@@ -161,6 +161,6 @@ var random = { // eslint-disable-line no-unused-vars
     return obj
   },
   hex: function (len) {
-    return Math.floor(Math.random() * ('0x1' + Array(len + 1).join('0'))).toString(16)
+    return this.number(Math.pow(2, len * 4)).toString(16)
   }
 }