diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 3bfcc7b..d882fa3 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1218,7 +1218,7 @@
  * ***************************************************************************
  */
 
-static ssize_t show_latency_timer(struct device *dev, char *buf)
+static ssize_t show_latency_timer(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
@@ -1245,7 +1245,7 @@
 }
 
 /* Write a new value of the latency timer, in units of milliseconds. */
-static ssize_t store_latency_timer(struct device *dev, const char *valbuf,
+static ssize_t store_latency_timer(struct device *dev, struct device_attribute *attr, const char *valbuf,
 				   size_t count)
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);
@@ -1276,7 +1276,7 @@
 
 /* Write an event character directly to the FTDI register.  The ASCII
    value is in the low 8 bits, with the enable bit in the 9th bit. */
-static ssize_t store_event_char(struct device *dev, const char *valbuf,
+static ssize_t store_event_char(struct device *dev, struct device_attribute *attr, const char *valbuf,
 				size_t count)
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);