diff --git a/lib/getRandomValue.js b/lib/getRandomValue.js
index 5d8797d..e2c24d2 100644
--- a/lib/getRandomValue.js
+++ b/lib/getRandomValue.js
@@ -1,9 +1,8 @@
 
 var crypto = require('crypto');
 
-var lim = Math.pow(2, 32) - 1;
+var lim = Math.pow(2, 32);
 
 module.exports = function random () {
-  return Math.abs(crypto.randomBytes(4)
-    .readInt32BE() / lim);
+  return crypto.randomBytes(4).readUInt32BE() / lim;
 };