diff --git a/libtextsecure/message_receiver.js b/libtextsecure/message_receiver.js
index 35c8c15086..ac52b0a9cf 100644
--- a/libtextsecure/message_receiver.js
+++ b/libtextsecure/message_receiver.js
@@ -558,23 +558,23 @@ MessageReceiver.prototype.extend({
     handleReceiptMessage: function(envelope, receiptMessage) {
         var results = [];
         if (receiptMessage.type === textsecure.protobuf.ReceiptMessage.Type.DELIVERY) {
-            for (var i = 0; i < receiptMessage.timestamps.length; ++i) {
+            for (var i = 0; i < receiptMessage.timestamp.length; ++i) {
                 var ev = new Event('delivery');
                 ev.confirm = this.removeFromCache.bind(this, envelope);
                 ev.deliveryReceipt = {
-                  timestamp    : receiptMessage.timestamps[i].toNumber(),
+                  timestamp    : receiptMessage.timestamp[i].toNumber(),
                   source       : envelope.source,
                   sourceDevice : envelope.sourceDevice
                 };
                 results.push(this.dispatchAndWait(ev));
             }
         } else if (receiptMessage.type === textsecure.protobuf.ReceiptMessage.Type.READ) {
-            for (var i = 0; i < receiptMessage.timestamps.length; ++i) {
+            for (var i = 0; i < receiptMessage.timestamp.length; ++i) {
                 var ev = new Event('read');
                 ev.confirm = this.removeFromCache.bind(this, envelope);
                 ev.timestamp = envelope.timestamp.toNumber();
                 ev.read = {
-                    timestamp : receiptMessage.timestamps[i].toNumber(),
+                    timestamp : receiptMessage.timestamp[i].toNumber(),
                     reader    : envelope.source
                 }
                 results.push(this.dispatchAndWait(ev));
diff --git a/libtextsecure/sendmessage.js b/libtextsecure/sendmessage.js
index c3a7762ac3..34072020f1 100644
--- a/libtextsecure/sendmessage.js
+++ b/libtextsecure/sendmessage.js
@@ -388,7 +388,7 @@ MessageSender.prototype = {
     sendReadReceipts: function(sender, timestamps) {
         var receiptMessage = new textsecure.protobuf.ReceiptMessage();
         receiptMessage.type = textsecure.protobuf.ReceiptMessage.Type.READ;
-        receiptMessage.timestamps = timestamps;
+        receiptMessage.timestamp = timestamps;
 
         var contentMessage = new textsecure.protobuf.Content();
         contentMessage.receiptMessage = receiptMessage;