1 files changed, 7 insertions, 2 deletions
diff --git a/lib/sendgrid.js b/lib/sendgrid.js
index 4150935..eb58f84 100644
--- a/lib/sendgrid.js
+++ b/lib/sendgrid.js
@@ -26,7 +26,7 @@ function isValidResponse(response) {
  * Helper to get a new empty request
  */
 function getEmptyRequest(data) {
-  let request = JSON.parse(JSON.stringify(emptyRequest));
+  var request = JSON.parse(JSON.stringify(emptyRequest));
   if (data && typeof data === 'object') {
     for (var key in data) {
       if (data.hasOwnProperty(key)) {
@@ -115,7 +115,12 @@ function SendGrid(apiKey, host, globalHeaders) {
 }
 
 //Try to use native promises by default
-SendGrid.Promise = Promise || null;
+if (typeof Promise !== 'undefined') {
+  SendGrid.Promise = Promise;
+}
+else {
+  SendGrid.Promise = null;
+}
 
 //Export
 module.exports = SendGrid;