diff --git a/artiq/gateware/drtio/rt_packet_satellite.py b/artiq/gateware/drtio/rt_packet_satellite.py
index 13bc921bb..249f8ca27 100644
--- a/artiq/gateware/drtio/rt_packet_satellite.py
+++ b/artiq/gateware/drtio/rt_packet_satellite.py
@@ -29,8 +29,6 @@ class RTPacketSatellite(Module):
         self.write_channel = Signal(16)
         self.write_address = Signal(16)
         self.write_data = Signal(512)
-        self.write_overflow = Signal()
-        self.write_underflow = Signal()
 
         self.read_channel = Signal(16)
         self.read_readable = Signal()