diff --git a/drivers/usb/misc/phidgetservo.c b/drivers/usb/misc/phidgetservo.c
index 4bd2915..b84eda6 100644
--- a/drivers/usb/misc/phidgetservo.c
+++ b/drivers/usb/misc/phidgetservo.c
@@ -207,7 +207,7 @@
 }
 
 #define show_set(value)	\
-static ssize_t set_servo##value (struct device *dev,			\
+static ssize_t set_servo##value (struct device *dev, struct device_attribute *attr,			\
 					const char *buf, size_t count)	\
 {									\
 	int degrees, minutes, retval;					\
@@ -233,7 +233,7 @@
 	return retval < 0 ? retval : count;				\
 }									\
 									\
-static ssize_t show_servo##value (struct device *dev, char *buf) 	\
+static ssize_t show_servo##value (struct device *dev, struct device_attribute *attr, char *buf) 	\
 {									\
 	struct usb_interface *intf = to_usb_interface (dev);		\
 	struct phidget_servo *servo = usb_get_intfdata (intf);		\