diff --git a/after/syntax/css/conditional-4.vim b/after/syntax/css/conditional-4.vim
new file mode 100644
index 0000000..e69de29
diff --git a/test/test.css b/test/test.css
index 8f2dad7..300b329 100644
--- a/test/test.css
+++ b/test/test.css
@@ -79,7 +79,11 @@
   display: revert;
 }
 
-@import "test.css" supports(display: auto);
+@import "conditional-3.css" supports(display: auto);
+
+@supports (selector(.conditional-4)) {
+  display: auto;
+}
 
 .color-3 {
   display: auto;