diff --git a/arch/x86_64/serial.c b/arch/x86_64/serial.c
index 04a45a6..c48f596 100644
--- a/arch/x86_64/serial.c
+++ b/arch/x86_64/serial.c
@@ -28,6 +28,10 @@ void serial_send_byte(int device, char out)
 
 	outportb(device, out);
 
+	if (device == COM1) {
+		outportb(0xe9, out);
+	}
+
 	while (!transmit_empty(device)) {
 		_count++;
 	}