diff --git a/__tests__/unit.js b/__tests__/unit.js
index 760b616..43c02e1 100644
--- a/__tests__/unit.js
+++ b/__tests__/unit.js
@@ -15,7 +15,7 @@ test('getPathWithQueryStringParams: no params', () => {
 test('getPathWithQueryStringParams: 1 param', () => {
   const event = {
     path: '/foo/bar',
-    queryStringParameters: {
+    queryString: {
       'bizz': 'bazz'
     }
   }
@@ -26,7 +26,7 @@ test('getPathWithQueryStringParams: 1 param', () => {
 test('getPathWithQueryStringParams: to be url-encoded param', () => {
   const event = {
     path: '/foo/bar',
-    queryStringParameters: {
+    queryString: {
       'redirect_uri': 'http://lvh.me:3000/cb'
     }
   }
@@ -37,7 +37,7 @@ test('getPathWithQueryStringParams: to be url-encoded param', () => {
 test('getPathWithQueryStringParams: 2 params', () => {
   const event = {
     path: '/foo/bar',
-    queryStringParameters: {
+    queryString: {
       'bizz': 'bazz',
       'buzz': 'bozz'
     }
diff --git a/src/index.js b/src/index.js
index 4c2d65f..75beb49 100644
--- a/src/index.js
+++ b/src/index.js
@@ -18,7 +18,7 @@ const url = require('url')
 const isType = require('type-is')
 
 function getPathWithQueryStringParams (event) {
-  return url.format({ pathname: event.path, query: event.queryStringParameters })
+  return url.format({ pathname: event.path, query: event.queryString })
 }
 function getEventBody (event) {
   return Buffer.from(event.body, event.isBase64Encoded ? 'base64' : 'utf8')