diff --git a/js/libtextsecure.js b/js/libtextsecure.js
index e57db3cd..97c3785e 100644
--- a/js/libtextsecure.js
+++ b/js/libtextsecure.js
@@ -39168,10 +39168,15 @@ TextSecureServer = function () {
         });
     };
 
-    self.sendMessages = function(destination, messageArray) {
+    self.sendMessages = function(destination, messageArray, legacy) {
         //TODO: Do this conversion somewhere else?
-        for (var i = 0; i < messageArray.length; i++)
-            messageArray[i].body = btoa(messageArray[i].body);
+        for (var i = 0; i < messageArray.length; i++) {
+            messageArray[i].content = btoa(messageArray[i].content);
+            if (legacy) {
+                messageArray[i].body = messageArray[i].content;
+                delete messageArray[i].content;
+            }
+        }
         var jsonData = { messages: messageArray };
         if (messageArray[0].relay !== undefined)
             jsonData.relay = messageArray[0].relay;
@@ -39700,7 +39705,7 @@ window.textsecure.messaging = function() {
                             type: encryptedMsg.type,
                             destinationDeviceId: textsecure.utils.unencodeNumber(deviceObjectList[i].encodedNumber)[1],
                             destinationRegistrationId: registrationId,
-                            body: encryptedMsg.body,
+                            content: encryptedMsg.body,
                             timestamp: timestamp
                         };
 
@@ -39714,7 +39719,8 @@ window.textsecure.messaging = function() {
         for (var i = 0; i < deviceObjectList.length; i++)
             promises[i] = addEncryptionFor(i);
         return Promise.all(promises).then(function() {
-            return TextSecureServer.sendMessages(number, jsonData);
+            var legacy = (message instanceof textsecure.protobuf.DataMessage);
+            return TextSecureServer.sendMessages(number, jsonData, legacy);
         });
     }
 
diff --git a/libtextsecure/api.js b/libtextsecure/api.js
index eb1a8107..67c5dadc 100644
--- a/libtextsecure/api.js
+++ b/libtextsecure/api.js
@@ -248,10 +248,15 @@ TextSecureServer = function () {
         });
     };
 
-    self.sendMessages = function(destination, messageArray) {
+    self.sendMessages = function(destination, messageArray, legacy) {
         //TODO: Do this conversion somewhere else?
-        for (var i = 0; i < messageArray.length; i++)
-            messageArray[i].body = btoa(messageArray[i].body);
+        for (var i = 0; i < messageArray.length; i++) {
+            messageArray[i].content = btoa(messageArray[i].content);
+            if (legacy) {
+                messageArray[i].body = messageArray[i].content;
+                delete messageArray[i].content;
+            }
+        }
         var jsonData = { messages: messageArray };
         if (messageArray[0].relay !== undefined)
             jsonData.relay = messageArray[0].relay;
diff --git a/libtextsecure/sendmessage.js b/libtextsecure/sendmessage.js
index 517a20dd..33459e18 100644
--- a/libtextsecure/sendmessage.js
+++ b/libtextsecure/sendmessage.js
@@ -74,7 +74,7 @@ window.textsecure.messaging = function() {
                             type: encryptedMsg.type,
                             destinationDeviceId: textsecure.utils.unencodeNumber(deviceObjectList[i].encodedNumber)[1],
                             destinationRegistrationId: registrationId,
-                            body: encryptedMsg.body,
+                            content: encryptedMsg.body,
                             timestamp: timestamp
                         };
 
@@ -88,7 +88,8 @@ window.textsecure.messaging = function() {
         for (var i = 0; i < deviceObjectList.length; i++)
             promises[i] = addEncryptionFor(i);
         return Promise.all(promises).then(function() {
-            return TextSecureServer.sendMessages(number, jsonData);
+            var legacy = (message instanceof textsecure.protobuf.DataMessage);
+            return TextSecureServer.sendMessages(number, jsonData, legacy);
         });
     }