diff --git a/drivers/comedi/drivers/dt282x.c b/drivers/comedi/drivers/dt282x.c
index 4ae80e6c7266..29832e1f062d 100644
--- a/drivers/comedi/drivers/dt282x.c
+++ b/drivers/comedi/drivers/dt282x.c
@@ -1064,7 +1064,12 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	struct comedi_subdevice *s;
 	int ret;
 
-	ret = comedi_request_region(dev, it->options[0], 0x10);
+	/*
+	 * Although it has only 16 bytes (8 16-bit registers), it needs to
+	 * start on a 32-byte boundary in range 0x200 to 0x3E0.
+	 */
+	ret = comedi_check_request_region(dev, it->options[0], 0x10,
+					  0x200, 0x3ff, 32);
 	if (ret)
 		return ret;