diff --git a/server/sms/receive.js b/server/sms/receive.js
index 956f8c16e..866bdb889 100644
--- a/server/sms/receive.js
+++ b/server/sms/receive.js
@@ -77,7 +77,7 @@ exports.receive = (req, res) => {
                 },
                 tokens: uniqueTokens,
               };
-              res.status(200).send();
+              res.status(200).send("");
               // Send a message to the device corresponding to the provided
               // registration token.
               admin