Index: uspace/srv/hid/output/ctl/serial.c
===================================================================
--- uspace/srv/hid/output/ctl/serial.c	(revision 8d2dd7f2d52fbc7693f94b66e451eeff3756d061)
+++ uspace/srv/hid/output/ctl/serial.c	(revision bbc6277ad36dbd4db13407f458067acf6bb14623)
@@ -105,4 +105,11 @@
 }
 
+static void serial_flush(outdev_t *dev)
+{
+	vt100_state_t *state = (vt100_state_t *) dev->data;
+
+	vt100_flush(state);
+}
+
 static outdev_ops_t serial_ops = {
 	.yield = serial_yield,
@@ -111,13 +118,14 @@
 	.get_caps = serial_get_caps,
 	.cursor_update = serial_cursor_update,
-	.char_update = serial_char_update
+	.char_update = serial_char_update,
+	.flush = serial_flush
 };
 
 int serial_init(vt100_putchar_t putchar_fn,
-    vt100_control_puts_t control_puts_fn)
+    vt100_control_puts_t control_puts_fn, vt100_flush_t flush_fn)
 {
 	vt100_state_t *state =
 	    vt100_state_create(SERIAL_COLS, SERIAL_ROWS, putchar_fn,
-	    control_puts_fn);
+	    control_puts_fn, flush_fn);
 	if (state == NULL)
 		return ENOMEM;
Index: uspace/srv/hid/output/ctl/serial.h
===================================================================
--- uspace/srv/hid/output/ctl/serial.h	(revision 8d2dd7f2d52fbc7693f94b66e451eeff3756d061)
+++ uspace/srv/hid/output/ctl/serial.h	(revision bbc6277ad36dbd4db13407f458067acf6bb14623)
@@ -36,5 +36,5 @@
 #include "../proto/vt100.h"
 
-extern int serial_init(vt100_putchar_t, vt100_control_puts_t);
+extern int serial_init(vt100_putchar_t, vt100_control_puts_t, vt100_flush_t);
 
 #endif