diff --git a/drivers/staging/most/cdev/cdev.c b/drivers/staging/most/cdev/cdev.c
index d98977c57a4b..d0cc0b746107 100644
--- a/drivers/staging/most/cdev/cdev.c
+++ b/drivers/staging/most/cdev/cdev.c
@@ -555,7 +555,7 @@ static void __exit mod_exit(void)
 		destroy_cdev(c);
 		destroy_channel(c);
 	}
-	unregister_chrdev_region(comp.devno, 1);
+	unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
 	ida_destroy(&comp.minor_id);
 	class_destroy(comp.class);
 }