diff --git a/test/index.test.js b/test/index.test.js
index 430f913..9fff84c 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -886,6 +886,13 @@ const tests = [
     options: { mode: "pure" },
     error: /is not pure/,
   },
+  {
+    name: "throw on global styles with a local selector",
+    input: `html { a_value: some-value; .foo { a_value: some-value; } }`,
+    expected: `html { a_value: some-value; :local(.foo) { a_value: some-value; } }`,
+    options: { mode: "pure" },
+    error: /is not pure/,
+  },
   {
     name: "css nesting",
     input: `