diff --git a/dom/mobilemessage/src/MmsMessage.cpp b/dom/mobilemessage/src/MmsMessage.cpp
index a1ba6b07556..41cdc565ab4 100644
--- a/dom/mobilemessage/src/MmsMessage.cpp
+++ b/dom/mobilemessage/src/MmsMessage.cpp
@@ -61,6 +61,7 @@ MmsMessage::MmsMessage(int32_t                         aId,
 
 MmsMessage::MmsMessage(const mobilemessage::MmsMessageData& aData)
   : mId(aData.id())
+  , mThreadId(aData.threadId())
   , mDelivery(aData.delivery())
   , mDeliveryStatus(aData.deliveryStatus())
   , mSender(aData.sender())
@@ -281,6 +282,7 @@ MmsMessage::GetData(ContentParent* aParent,
   NS_ASSERTION(aParent, "aParent is null");
 
   aData.id() = mId;
+  aData.threadId() = mThreadId;
   aData.delivery() = mDelivery;
   aData.deliveryStatus() = mDeliveryStatus;
   aData.sender().Assign(mSender);
diff --git a/dom/mobilemessage/src/ipc/SmsTypes.ipdlh b/dom/mobilemessage/src/ipc/SmsTypes.ipdlh
index 79260f96839..b0f17cc7961 100644
--- a/dom/mobilemessage/src/ipc/SmsTypes.ipdlh
+++ b/dom/mobilemessage/src/ipc/SmsTypes.ipdlh
@@ -48,6 +48,7 @@ struct MmsAttachmentData
 struct MmsMessageData
 {
   int32_t             id;
+  uint64_t            threadId;
   DeliveryState       delivery;
   DeliveryStatus[]    deliveryStatus;
   nsString            sender;