diff --git a/src/engine.cpp b/src/engine.cpp
index abcf4f9d7a..8bd14849ad 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -685,7 +685,8 @@ void StartupOneEngine(Engine *e, Date aging_date)
 	}
 
 	SetRandomSeed(_settings_game.game_creation.generation_seed ^
-	              re->index ^
+	              (re->index << 16) ^ (re->info.base_intro << 12) ^ (re->info.decay_speed << 8) ^
+	              (re->info.lifelength << 4) ^ re->info.retire_early ^
 	              e->type ^
 	              e->GetGRFID());