diff --git a/lib/utils.js b/lib/utils.js
index 4401501d..7e7b9c19 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -319,11 +319,11 @@ class Lcg {
   }
 
   nextBuffer (len) {
-    let arr = [];
+    let arr = new Uint8Array(len);
     for (let i = 0; i < len; i++) {
-      arr.push(this.nextInt(256));
+      arr[i] = this.nextInt(256);
     }
-    return Buffer.from(arr);
+    return arr;
   }
 
   choice (arr) {