diff --git a/test/sqids_test.exs b/test/sqids_test.exs
index 3b7b009..50b8537 100644
--- a/test/sqids_test.exs
+++ b/test/sqids_test.exs
@@ -1,6 +1,8 @@
 defmodule SqidsTest do
   # doctest Sqids
 
+  require Bitwise
+
   ## Shared between test cases
 
   defmodule Shared do