diff --git a/src/chat/chat-room/chat-room.cpp b/src/chat/chat-room/chat-room.cpp
index 30e0a8843..69e1e3f94 100644
--- a/src/chat/chat-room/chat-room.cpp
+++ b/src/chat/chat-room/chat-room.cpp
@@ -416,7 +416,11 @@ int ChatRoom::getChatMessageCount () const {
 }
 
 int ChatRoom::getUnreadChatMessageCount () const {
-	return getCore()->getPrivate()->mainDb->getUnreadChatMessageCount(getChatRoomId());
+	L_D();
+	int dbUnreadCount = getCore()->getPrivate()->mainDb->getUnreadChatMessageCount(getChatRoomId());
+	int notifiedCount = d->imdnHandler->getDisplayNotificationCount();
+	L_ASSERT(dbUnreadCount >= notifiedCount);
+	return dbUnreadCount - notifiedCount;
 }
 
 // -----------------------------------------------------------------------------
diff --git a/src/chat/notification/imdn.cpp b/src/chat/notification/imdn.cpp
index 6cccf52f0..b538cf015 100644
--- a/src/chat/notification/imdn.cpp
+++ b/src/chat/notification/imdn.cpp
@@ -48,6 +48,12 @@ Imdn::~Imdn () {
 
 // -----------------------------------------------------------------------------
 
+int Imdn::getDisplayNotificationCount () const {
+	return static_cast<int>(displayedMessages.size());
+}
+
+// -----------------------------------------------------------------------------
+
 void Imdn::notifyDelivery (const shared_ptr<ChatMessage> &message) {
 	if (find(deliveredMessages.begin(), deliveredMessages.end(), message) == deliveredMessages.end()) {
 		deliveredMessages.push_back(message);
diff --git a/src/chat/notification/imdn.h b/src/chat/notification/imdn.h
index 0d1b00940..cf8c46eb8 100644
--- a/src/chat/notification/imdn.h
+++ b/src/chat/notification/imdn.h
@@ -53,6 +53,8 @@ public:
 	Imdn (ChatRoom *chatRoom);
 	~Imdn ();
 
+	int getDisplayNotificationCount () const;
+
 	void notifyDelivery (const std::shared_ptr<ChatMessage> &message);
 	void notifyDeliveryError (const std::shared_ptr<ChatMessage> &message, LinphoneReason reason);
 	void notifyDisplay (const std::shared_ptr<ChatMessage> &message);