diff --git a/examples/sim/fir.py b/examples/sim/fir.py
index 3b4b8d8ab..1415fbfdd 100644
--- a/examples/sim/fir.py
+++ b/examples/sim/fir.py
@@ -66,6 +66,7 @@ def main():
 		fragment = autofragment.from_local()
 		sim = Simulator(fragment, Runner())
 		sim.run(100)
+		del sim
 		in_signals += tb.inputs
 		out_signals += tb.outputs
 	
diff --git a/migen/sim/generic.py b/migen/sim/generic.py
index 70ca18039..e027dc9c8 100644
--- a/migen/sim/generic.py
+++ b/migen/sim/generic.py
@@ -158,6 +158,9 @@ class Simulator:
 			for k, v in value.items():
 				self.multiwrite(getattr(obj, k), v)
 
+	def __del__(self):
+		del self.ipc
+		del self.sim_runner
 
 # Contrary to multiread/multiwrite, Proxy fetches the necessary signals only and
 # immediately forwards writes into the simulation.