diff --git a/assignment/system.py b/assignment/system.py
index 188ce96..f185371 100644
--- a/assignment/system.py
+++ b/assignment/system.py
@@ -31,6 +31,10 @@ class LockQueueingSystem(CoupledDEVS):
             gen_num=gen_num,
         ))
 
+        queue = self.addSubModel(Queue(
+            ship_sizes=set(gen_types), # the queue only needs to know the different ship sizes (and create a FIFO queue for each)
+        ))
+
         if load_balancer_strategy == STRATEGY_ROUND_ROBIN:
             LoadBalancer = RoundRobinLoadBalancer
         elif load_balancer_strategy == STRATEGY_FILL_ER_UP: