diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 4ac2de43cdbb..5af3579337eb 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -247,7 +247,7 @@ struct comedi_device {
 	void (*close) (struct comedi_device *dev);
 };
 
-static inline const void *comedi_board(struct comedi_device *dev)
+static inline const void *comedi_board(const struct comedi_device *dev)
 {
 	return dev->board_ptr;
 }