diff --git a/include/linphone/utils/general.h b/include/linphone/utils/general.h
index 1ccee3b72..7ade05a19 100644
--- a/include/linphone/utils/general.h
+++ b/include/linphone/utils/general.h
@@ -180,6 +180,15 @@ struct AddConstMirror<const T, U> {
 		>::type * \
 	>(CLASS::mPrivate);
 
+// Get Private data of class in a multiple inheritance case.
+#define L_Q_T(CLASS, NAME) \
+	auto const NAME = static_cast< \
+		AddConstMirror< \
+			std::remove_reference<decltype(*this)>::type, \
+			CLASS \
+		>::type * \
+	>(getPublic());
+
 #define L_OVERRIDE_SHARED_FROM_THIS(CLASS) \
 	inline std::shared_ptr<CLASS> getSharedFromThis () { \
 		return std::static_pointer_cast<CLASS>(Object::getSharedFromThis()); \
diff --git a/src/chat/chat-room/client-group-chat-room.cpp b/src/chat/chat-room/client-group-chat-room.cpp
index aee176244..15d7d0251 100644
--- a/src/chat/chat-room/client-group-chat-room.cpp
+++ b/src/chat/chat-room/client-group-chat-room.cpp
@@ -41,11 +41,12 @@ ClientGroupChatRoomPrivate::ClientGroupChatRoomPrivate (LinphoneCore *core) : Ch
 
 shared_ptr<CallSession> ClientGroupChatRoomPrivate::createSession () {
 	L_Q();
+	L_Q_T(RemoteConference, qConference);
 
 	CallSessionParams csp;
 	csp.addCustomHeader("Require", "recipient-list-invite");
 
-	shared_ptr<Participant> focus = static_cast<RemoteConference *>(q)->getPrivate()->focus;
+	shared_ptr<Participant> focus = qConference->getPrivate()->focus;
 	shared_ptr<CallSession> session = focus->getPrivate()->createSession(*q, &csp, false, q);
 	const Address &myAddress = q->getMe()->getAddress();
 	session->configure(LinphoneCallOutgoing, nullptr, nullptr, myAddress, focus->getAddress());
@@ -58,8 +59,8 @@ shared_ptr<CallSession> ClientGroupChatRoomPrivate::createSession () {
 }
 
 void ClientGroupChatRoomPrivate::notifyReceived (string body) {
-	L_Q();
-	static_cast<RemoteConference *>(q)->getPrivate()->eventHandler->notifyReceived(body);
+	L_Q_T(RemoteConference, qConference);
+	qConference->getPrivate()->eventHandler->notifyReceived(body);
 }
 
 // =============================================================================