diff --git a/lib/sequence.js b/lib/sequence.js
index 40ca1ca2..fbf2363f 100644
--- a/lib/sequence.js
+++ b/lib/sequence.js
@@ -101,3 +101,5 @@ MaterializedSequence.prototype = {
       return priorStepPromise;
     }
 };
+
+module.exports = MaterializedSequence;