diff --git a/index.js b/index.js
index <HASH>..<HASH> 100644
--- a/index.js
+++ b/index.js
@@ -34,8 +34,8 @@ function sortOutputs (outputs) {
 }
 
 module.exports = {
-  inputComparator,
-  outputComparator,
+  inputComparator: inputComparator,
+  outputComparator: outputComparator,
 
   sortInputs: sortInputs,
   sortOutputs: sortOutputs
fix mistaken use of ES6