diff --git a/src/conference/remote-conference.cpp b/src/conference/remote-conference.cpp
index aca20de9f..ef6e4dd0f 100644
--- a/src/conference/remote-conference.cpp
+++ b/src/conference/remote-conference.cpp
@@ -61,7 +61,7 @@ void RemoteConference::removeParticipant (const shared_ptr<const Participant> &p
 }
 
 
-string RemoteConference::getResourceLists (const list<Address> &addresses) {
+string RemoteConference::getResourceLists (const list<Address> &addresses) const {
 	ResourceLists rl = ResourceLists();
 	ListType l = ListType();
 	for (const auto &addr : addresses) {
diff --git a/src/conference/remote-conference.h b/src/conference/remote-conference.h
index ea97a397f..572873136 100644
--- a/src/conference/remote-conference.h
+++ b/src/conference/remote-conference.h
@@ -40,7 +40,7 @@ public:
 	void addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
 	void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
 
-	std::string getResourceLists (const std::list<Address> &addresses);
+	std::string getResourceLists (const std::list<Address> &addresses) const;
 
 protected:
 	/* ConferenceListener */