diff --git a/misoclib/com/liteeth/phy/gmii.py b/misoclib/com/liteeth/phy/gmii.py
index bccaf1db7..998522b3c 100644
--- a/misoclib/com/liteeth/phy/gmii.py
+++ b/misoclib/com/liteeth/phy/gmii.py
@@ -5,7 +5,7 @@ from misoclib.com.liteeth.generic import *
 
 
 class LiteEthPHYGMIITX(Module):
-    def __init__(self, pads, pads_register):
+    def __init__(self, pads, pads_register=True):
         self.sink = sink = Sink(eth_phy_description(8))
 
         # # #