diff --git a/misoclib/com/uart/phy/sim.py b/misoclib/com/uart/phy/sim.py
index 4682a53f6..c628ea92e 100644
--- a/misoclib/com/uart/phy/sim.py
+++ b/misoclib/com/uart/phy/sim.py
@@ -2,7 +2,7 @@ from migen.fhdl.std import *
 from migen.flow.actor import Sink, Source
 
 class UARTPHYSim(Module):
-	def __init__(self, pads):
+	def __init__(self, pads, *args, **kwargs):
 		self.sink = Sink([("data", 8)])
 		self.source = Source([("data", 8)])