diff --git a/test/less/import.less b/test/less/import.less
index 9f8b2914..e59754fa 100644
--- a/test/less/import.less
+++ b/test/less/import.less
@@ -2,6 +2,8 @@
 
 @import url(/absolute/something.css) screen and (color) and (max-width: 600px);
 
+@import (optional) "file-does-not-exist.does-not-exist";
+
 @var: 100px;
 @import url("//ha.com/file.css") (min-width:@var);