diff --git a/src/emu/machine/n68681.c b/src/emu/machine/n68681.c
index 1baed11500a..10d06a92aa0 100644
--- a/src/emu/machine/n68681.c
+++ b/src/emu/machine/n68681.c
@@ -532,6 +532,7 @@ void duart68681_channel::device_reset()
 	write_CR(0x40); // reset errors
 
 	tx_baud_rate = rx_baud_rate = 0;
+	CSR = 0;
 }
 
 // serial device virtual overrides