diff --git a/tests/css/CSSTest.php b/tests/css/CSSTest.php
index 1dffeb5..60123a9 100644
--- a/tests/css/CSSTest.php
+++ b/tests/css/CSSTest.php
@@ -777,6 +777,12 @@ public function dataProvider()
             'p{color:#ff0}',
         );
 
+        // https://github.com/matthiasmullie/minify/issues/267
+        $tests[] = array(
+            'ul p { padding-left: calc((var(--icon-size) / 2) + var(--horisontal-space)); }',
+            'ul p{padding-left:calc((var(--icon-size) / 2) + var(--horisontal-space))}',
+        );
+
         return $tests;
     }