diff --git a/src/add-ons/kernel/drivers/input/usb_hid/MouseDevice.h b/src/add-ons/kernel/drivers/input/usb_hid/MouseDevice.h
index 67c89391ae..4d30753e05 100644
--- a/src/add-ons/kernel/drivers/input/usb_hid/MouseDevice.h
+++ b/src/add-ons/kernel/drivers/input/usb_hid/MouseDevice.h
@@ -45,7 +45,6 @@ private:
 			uint32				fClickCount;
 			bigtime_t			fLastClickTime;
 			bigtime_t			fClickSpeed;
-			uint32				fMaxButtons;
 };
 
 #endif // USB_MOUSE_DEVICE_H