diff --git a/index.js b/index.js
deleted file mode 100644
index ee62f3a..0000000
--- a/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require('./lib/retry');
\ No newline at end of file
diff --git a/index.mjs b/index.mjs
new file mode 100644
index 0000000..6615177
--- /dev/null
+++ b/index.mjs
@@ -0,0 +1,2 @@
+import retry from './lib/retry.mjs'
+export default retry
diff --git a/lib/retry.js b/lib/retry.mjs
similarity index 96%
rename from lib/retry.js
rename to lib/retry.mjs
index 5e85e79..2fe9da6 100644
--- a/lib/retry.js
+++ b/lib/retry.mjs
@@ -1,4 +1,6 @@
-var RetryOperation = require('./retry_operation');
+import RetryOperation from './retry_operation.mjs'
+
+var exports = {}
 
 exports.operation = function(options) {
   var timeouts = exports.timeouts(options);
@@ -98,3 +100,5 @@ exports.wrap = function(obj, options, methods) {
     obj[method].options = options;
   }
 };
+
+export default exports
diff --git a/lib/retry_operation.js b/lib/retry_operation.mjs
similarity index 99%
rename from lib/retry_operation.js
rename to lib/retry_operation.mjs
index 105ce72..2c03fb7 100644
--- a/lib/retry_operation.js
+++ b/lib/retry_operation.mjs
@@ -21,7 +21,6 @@ function RetryOperation(timeouts, options) {
     this._cachedTimeouts = this._timeouts.slice(0);
   }
 }
-module.exports = RetryOperation;
 
 RetryOperation.prototype.reset = function() {
   this._attempts = 1;
@@ -160,3 +159,5 @@ RetryOperation.prototype.mainError = function() {
 
   return mainError;
 };
+
+export default RetryOperation
diff --git a/package.json b/package.json
index 4e72bef..bd601f6 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
   "directories": {
     "lib": "./lib"
   },
-  "main": "index.js",
+  "main": "index.mjs",
   "engines": {
     "node": ">= 4"
   },