diff --git a/examples/memory_sim.py b/examples/memory_sim.py
index dae392572..571bad2eb 100644
--- a/examples/memory_sim.py
+++ b/examples/memory_sim.py
@@ -1,5 +1,5 @@
 from migen.fhdl.structure import *
-from migen.sim.generic import Simulator, TopLevel
+from migen.sim.generic import Simulator
 from migen.sim.icarus import Runner
 
 class Mem: