diff --git a/website/api/controllers/deliver-apple-csr.js b/website/api/controllers/deliver-apple-csr.js
index 834b13dff8..238d8a97af 100644
--- a/website/api/controllers/deliver-apple-csr.js
+++ b/website/api/controllers/deliver-apple-csr.js
@@ -139,7 +139,11 @@ module.exports = {
       template: 'email-signed-csr-for-apns',
       templateData: {},
       attachments: [{
-        contentBytes: generateCertificateResult.request,
+        // When the file is provided as an attachment to the Sails helper, it
+        // gets decoded, since we need for the signed CSR to be delivered in
+        // base64 format, we doubly encode the contents before sending the
+        // email.
+        contentBytes: Buffer.from(generateCertificateResult.request).toString('base64'),
         name: 'apple-apns-request.txt',
         type: 'text/plain',
       }],