diff --git a/test/rb/integration/TestClient.rb b/test/rb/integration/TestClient.rb
index b31a024..fb339c4 100755
--- a/test/rb/integration/TestClient.rb
+++ b/test/rb/integration/TestClient.rb
@@ -125,7 +125,7 @@
 
   def test_binary
     p 'test_binary'
-    val = [42, 0, 142, 242]
+    val = (0...256).reverse_each.to_a
     ret = @client.testBinary(val.pack('C*'))
     assert_equal(val, ret.bytes.to_a)
   end