diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index e90e3cceb5f8..21d8c1c16cd8 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -101,7 +101,7 @@ static int do_insn_ioctl(struct comedi_device *dev,
 static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
 			 void *file);
 
-extern void do_become_nonbusy(struct comedi_device *dev,
+static void do_become_nonbusy(struct comedi_device *dev,
 			      struct comedi_subdevice *s);
 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);