diff --git a/src/components/chat/chat.js b/src/components/chat/chat.js
index 9c4e5b0554..803abf6988 100644
--- a/src/components/chat/chat.js
+++ b/src/components/chat/chat.js
@@ -204,9 +204,9 @@ const Chat = {
       }
     },
     readChat () {
-      if (!(this.currentChatMessageService && this.currentChatMessageService.lastMessage)) { return }
+      if (!(this.currentChatMessageService && this.currentChatMessageService.maxId)) { return }
       if (document.hidden) { return }
-      const lastReadId = this.currentChatMessageService.lastMessage.id
+      const lastReadId = this.currentChatMessageService.maxId
       this.$store.dispatch('readChat', { id: this.currentChat.id, lastReadId })
     },
     bottomedOut (offset) {
@@ -244,7 +244,7 @@ const Chat = {
 
       const chatId = chatMessageService.chatId
       const fetchOlderMessages = !!maxId
-      const sinceId = fetchLatest && chatMessageService.lastMessage && chatMessageService.lastMessage.id
+      const sinceId = fetchLatest && chatMessageService.maxId
 
       this.backendInteractor.chatMessages({ id: chatId, maxId, sinceId })
         .then((messages) => {
@@ -303,7 +303,11 @@ const Chat = {
 
       return this.backendInteractor.sendChatMessage(params)
         .then(data => {
-          this.$store.dispatch('addChatMessages', { chatId: this.currentChat.id, messages: [data] }).then(() => {
+          this.$store.dispatch('addChatMessages', {
+            chatId: this.currentChat.id,
+            messages: [data],
+            updateMaxId: false
+          }).then(() => {
             this.$nextTick(() => {
               this.handleResize()
               // When the posting form size changes because of a media attachment, we need an extra resize
diff --git a/src/modules/chats.js b/src/modules/chats.js
index c760901809..e752c6df8a 100644
--- a/src/modules/chats.js
+++ b/src/modules/chats.js
@@ -181,30 +181,16 @@ const chats = {
     setChatsLoading (state, { value }) {
       state.chats.loading = value
     },
-    addChatMessages (state, { commit, chatId, messages }) {
+    addChatMessages (state, { chatId, messages, updateMaxId }) {
       const chatMessageService = state.openedChatMessageServices[chatId]
       if (chatMessageService) {
-        chatService.add(chatMessageService, { messages: messages.map(parseChatMessage) })
-        commit('refreshLastMessage', { chatId })
+        chatService.add(chatMessageService, { messages: messages.map(parseChatMessage), updateMaxId })
       }
     },
-    refreshLastMessage (state, { chatId }) {
-      const chatMessageService = state.openedChatMessageServices[chatId]
-      if (chatMessageService) {
-        const chat = getChatById(state, chatId)
-        if (chat) {
-          chat.lastMessage = chatMessageService.lastMessage
-          if (chatMessageService.lastMessage) {
-            chat.updated_at = chatMessageService.lastMessage.created_at
-          }
-        }
-      }
-    },
-    deleteChatMessage (state, { commit, chatId, messageId }) {
+    deleteChatMessage (state, { chatId, messageId }) {
       const chatMessageService = state.openedChatMessageServices[chatId]
       if (chatMessageService) {
         chatService.deleteMessage(chatMessageService, messageId)
-        commit('refreshLastMessage', { chatId })
       }
     },
     resetChatNewMessageCount (state, _value) {
diff --git a/src/services/chat_service/chat_service.js b/src/services/chat_service/chat_service.js
index b60a889bd0..95c6948235 100644
--- a/src/services/chat_service/chat_service.js
+++ b/src/services/chat_service/chat_service.js
@@ -8,7 +8,7 @@ const empty = (chatId) => {
     lastSeenTimestamp: 0,
     chatId: chatId,
     minId: undefined,
-    lastMessage: undefined
+    maxId: undefined
   }
 }
 
@@ -18,7 +18,7 @@ const clear = (storage) => {
   storage.newMessageCount = 0
   storage.lastSeenTimestamp = 0
   storage.minId = undefined
-  storage.lastMessage = undefined
+  storage.maxId = undefined
 }
 
 const deleteMessage = (storage, messageId) => {
@@ -26,8 +26,9 @@ const deleteMessage = (storage, messageId) => {
   storage.messages = storage.messages.filter(m => m.id !== messageId)
   delete storage.idIndex[messageId]
 
-  if (storage.lastMessage && (storage.lastMessage.id === messageId)) {
-    storage.lastMessage = _.maxBy(storage.messages, 'id')
+  if (storage.maxId === messageId) {
+    const lastMessage = _.maxBy(storage.messages, 'id')
+    storage.maxId = lastMessage.id
   }
 
   if (storage.minId === messageId) {
@@ -36,7 +37,7 @@ const deleteMessage = (storage, messageId) => {
   }
 }
 
-const add = (storage, { messages: newMessages }) => {
+const add = (storage, { messages: newMessages, updateMaxId = true }) => {
   if (!storage) { return }
   for (let i = 0; i < newMessages.length; i++) {
     const message = newMessages[i]
@@ -48,8 +49,10 @@ const add = (storage, { messages: newMessages }) => {
       storage.minId = message.id
     }
 
-    if (!storage.lastMessage || message.id > storage.lastMessage.id) {
-      storage.lastMessage = message
+    if (!storage.maxId || message.id > storage.maxId) {
+      if (updateMaxId) {
+        storage.maxId = message.id
+      }
     }
 
     if (!storage.idIndex[message.id]) {
diff --git a/test/unit/specs/services/chat_service/chat_service.spec.js b/test/unit/specs/services/chat_service/chat_service.spec.js
index 3ee9839dfd..2eb89a2dff 100644
--- a/test/unit/specs/services/chat_service/chat_service.spec.js
+++ b/test/unit/specs/services/chat_service/chat_service.spec.js
@@ -33,12 +33,12 @@ describe('chatService', () => {
       const chat = chatService.empty()
 
       chatService.add(chat, { messages: [ message1 ] })
-      expect(chat.lastMessage.id).to.eql(message1.id)
+      expect(chat.maxId).to.eql(message1.id)
       expect(chat.minId).to.eql(message1.id)
       expect(chat.newMessageCount).to.eql(1)
 
       chatService.add(chat, { messages: [ message2 ] })
-      expect(chat.lastMessage.id).to.eql(message2.id)
+      expect(chat.maxId).to.eql(message2.id)
       expect(chat.minId).to.eql(message1.id)
       expect(chat.newMessageCount).to.eql(2)
 
@@ -60,15 +60,15 @@ describe('chatService', () => {
       chatService.add(chat, { messages: [ message2 ] })
       chatService.add(chat, { messages: [ message3 ] })
 
-      expect(chat.lastMessage.id).to.eql(message3.id)
+      expect(chat.maxId).to.eql(message3.id)
       expect(chat.minId).to.eql(message1.id)
 
       chatService.deleteMessage(chat, message3.id)
-      expect(chat.lastMessage.id).to.eql(message2.id)
+      expect(chat.maxId).to.eql(message2.id)
       expect(chat.minId).to.eql(message1.id)
 
       chatService.deleteMessage(chat, message1.id)
-      expect(chat.lastMessage.id).to.eql(message2.id)
+      expect(chat.maxId).to.eql(message2.id)
       expect(chat.minId).to.eql(message2.id)
     })
   })