diff --git a/src/lib/index.ts b/src/lib/index.ts
index bc7eecd..5d3ef74 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -24,6 +24,7 @@ import {
 	type StyleSheet,
 	type CSSNode,
 	is_type_selector,
+	is_universal_selector,
 	is_combinator,
 	is_pseudo_class_selector,
 	is_pseudo_element_selector,
@@ -187,7 +188,13 @@ function print_simple_selector(
 	is_first: boolean = false,
 ): string {
 	if (is_type_selector(node)) {
-		return node.name.toLowerCase()
+		let prefix = node.namespace === null ? '' : node.namespace.toLowerCase() + '|'
+		return prefix + node.name.toLowerCase()
+	}
+
+	if (is_universal_selector(node)) {
+		let prefix = node.namespace === null ? '' : node.namespace.toLowerCase() + '|'
+		return prefix + '*'
 	}
 
 	if (is_combinator(node)) {
diff --git a/test/selectors.test.ts b/test/selectors.test.ts
index fadf762..79c0834 100644
--- a/test/selectors.test.ts
+++ b/test/selectors.test.ts
@@ -260,3 +260,17 @@ test('handles syntax errors', () => {
 	let expected = `test {}`
 	expect(actual).toEqual(expected)
 })
+
+test.each([
+	[`ns|div {}`, `ns|div {}`],
+	[`NS|div {}`, `ns|div {}`],
+	[`*|div {}`, `*|div {}`],
+	[`|div {}`, `|div {}`],
+	[`ns|* {}`, `ns|* {}`],
+	[`*|* {}`, `*|* {}`],
+	[`|* {}`, `|* {}`],
+	[`ns|div, ns|span {}`, `ns|div,\nns|span {}`],
+])('formats namespace selectors: %s', (css, expected) => {
+	let actual = format(css)
+	expect(actual).toEqual(expected)
+})