diff --git a/drivers/serial/serial_s5pc1xx.c b/drivers/serial/serial_s5pc1xx.c
index 73669a9..8da0c86 100644
--- a/drivers/serial/serial_s5pc1xx.c
+++ b/drivers/serial/serial_s5pc1xx.c
@@ -185,6 +185,7 @@
 	name, \
 	bus, \
 	s5p_serial##port##_init, \
+	NULL, \
 	s5p_serial##port##_setbrg, \
 	s5p_serial##port##_getc, \
 	s5p_serial##port##_tstc, \