diff --git a/src/game_initialization/create_engine.cpp b/src/game_initialization/create_engine.cpp
index e2111b696a3..39811868303 100644
--- a/src/game_initialization/create_engine.cpp
+++ b/src/game_initialization/create_engine.cpp
@@ -1067,6 +1067,7 @@ const mp_game_settings& create_engine::get_parameters()
 
 	int era_index = current_level().allow_era_choice() ? current_era_index_ : 0;
 	state_.mp_settings().mp_era = eras_[era_index]->id;
+	state_.mp_settings().mp_era_addon_id = (*eras_[era_index]->cfg)["addon_id"].str();
 
 	return state_.mp_settings();
 }