diff --git a/mibuild/platforms/sim.py b/mibuild/platforms/sim.py
index db48ec2c3..64b032036 100644
--- a/mibuild/platforms/sim.py
+++ b/mibuild/platforms/sim.py
@@ -14,6 +14,18 @@ _io = [
 		Subsignal("source_ack", SimPins(1)),
 		Subsignal("source_data", SimPins(8)),
 
+		Subsignal("sink_stb", SimPins(1)),
+		Subsignal("sink_ack", SimPins(1)),
+		Subsignal("sink_data", SimPins(8)),
+	),
+	("eth_clocks", 0,
+		Subsignal("none", SimPins(1)),
+	),
+	("eth", 0,
+		Subsignal("source_stb", SimPins(1)),
+		Subsignal("source_ack", SimPins(1)),
+		Subsignal("source_data", SimPins(8)),
+
 		Subsignal("sink_stb", SimPins(1)),
 		Subsignal("sink_ack", SimPins(1)),
 		Subsignal("sink_data", SimPins(8)),