diff --git a/test/data/onetimeauth.spec.js b/test/data/onetimeauth.spec.js
index 87d54c73..19260b68 100644
--- a/test/data/onetimeauth.spec.js
+++ b/test/data/onetimeauth.spec.js
@@ -24,5 +24,10 @@ module.exports = [
     m: new Uint8Array(2007),
     k: new Uint8Array(32),
     out: new Uint8Array(16)
+  },
+  {
+    m:  new Uint8Array([255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]),
+    k: new Uint8Array([2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]),
+    out: new Uint8Array( [3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
   }
 ];