diff --git a/src/gui/dialogs/multiplayer/lobby.cpp b/src/gui/dialogs/multiplayer/lobby.cpp
index 879f41caef20..7c2dec5e9a70 100644
--- a/src/gui/dialogs/multiplayer/lobby.cpp
+++ b/src/gui/dialogs/multiplayer/lobby.cpp
@@ -788,7 +788,7 @@ void mp_lobby::pre_show(window& window)
 			*filter_text_,
 			std::bind(&mp_lobby::game_filter_keypress_callback, this, _5));
 
-	chatbox_->room_window_open("lobby", true, false);
+	chatbox_->room_window_open(N_("lobby"), true, false);
 	chatbox_->active_window_changed();
 	game_filter_reload();
 
diff --git a/src/gui/dialogs/multiplayer/mp_join_game.cpp b/src/gui/dialogs/multiplayer/mp_join_game.cpp
index caf87c0db1b7..20d465dd1f8f 100644
--- a/src/gui/dialogs/multiplayer/mp_join_game.cpp
+++ b/src/gui/dialogs/multiplayer/mp_join_game.cpp
@@ -244,7 +244,7 @@ void mp_join_game::pre_show(window& window)
 	chat.set_lobby_info(lobby_info_);
 	chat.set_wesnothd_connection(network_connection_);
 
-	chat.room_window_open("this game", true, false); // TODO: better title?
+	chat.room_window_open(N_("this game"), true, false);
 	chat.active_window_changed();
 	chat.load_log(default_chat_log, false);
 
diff --git a/src/gui/dialogs/multiplayer/mp_staging.cpp b/src/gui/dialogs/multiplayer/mp_staging.cpp
index d3a459053986..1186a28c6177 100644
--- a/src/gui/dialogs/multiplayer/mp_staging.cpp
+++ b/src/gui/dialogs/multiplayer/mp_staging.cpp
@@ -102,7 +102,7 @@ void mp_staging::pre_show(window& window)
 		chat.set_wesnothd_connection(*network_connection_);
 	}
 
-	chat.room_window_open("this game", true, false); // TODO: better title?
+	chat.room_window_open(N_("this game"), true, false);
 	chat.active_window_changed();
 	chat.load_log(default_chat_log, false);
 
diff --git a/src/gui/widgets/chatbox.cpp b/src/gui/widgets/chatbox.cpp
index bcbe5383b945..6cd085739d33 100644
--- a/src/gui/widgets/chatbox.cpp
+++ b/src/gui/widgets/chatbox.cpp
@@ -377,9 +377,9 @@ bool chatbox::room_window_active(const std::string& room)
 	return t.name == room && t.whisper == false;
 }
 
-lobby_chat_window* chatbox::room_window_open(const std::string& room, const bool open_new, const bool allow_close)
+lobby_chat_window* chatbox::room_window_open(const t_string& room, const bool open_new, const bool allow_close)
 {
-	return find_or_create_window(room, false, open_new, allow_close,
+	return find_or_create_window(room.base_str(), false, open_new, allow_close,
 		VGETTEXT("Room <i>“$name”</i> joined", { { "name", room } }));
 }
 
diff --git a/src/gui/widgets/chatbox.hpp b/src/gui/widgets/chatbox.hpp
index 0879e19aa144..f0c8de62be63 100644
--- a/src/gui/widgets/chatbox.hpp
+++ b/src/gui/widgets/chatbox.hpp
@@ -18,6 +18,7 @@
 #include "game_initialization/lobby_data.hpp"
 #include "game_initialization/lobby_info.hpp"
 #include "gui/widgets/container_base.hpp"
+#include "tstring.hpp"
 
 #include <map>
 #include <string>
@@ -231,7 +232,7 @@ class chatbox : public container_base, public events::chat_handler
 	 * 'close' button will be disabled.
 	 * @return valid ptr if the window was found or added, null otherwise
 	 */
-	lobby_chat_window* room_window_open(const std::string& room,
+	lobby_chat_window* room_window_open(const t_string& room,
 		const bool open_new, const bool allow_close = true);
 
 	/**