diff --git a/misoclib/com/liteeth/phy/gmii.py b/misoclib/com/liteeth/phy/gmii.py
index 1b8893a56..3d020b928 100644
--- a/misoclib/com/liteeth/phy/gmii.py
+++ b/misoclib/com/liteeth/phy/gmii.py
@@ -7,8 +7,9 @@ class LiteEthPHYGMIITX(Module):
 	def __init__(self, pads):
 		self.sink = sink = Sink(eth_phy_description(8))
 		###
+		if hasattr(pads, "tx_er"):
+			self.sync += pads.tx_er.eq(0)
 		self.sync += [
-			pads.tx_er.eq(0),
 			pads.tx_en.eq(sink.stb),
 			pads.tx_data.eq(sink.data)
 		]