diff --git a/index.js b/index.js
index 17d1624..b3d5c1d 100644
--- a/index.js
+++ b/index.js
@@ -424,8 +424,10 @@ export function format(css, { minify = false } = {}) {
 			value += SPACE
 		}
 
-		if (node.important) {
+		if (node.important === true) {
 			value += OPTIONAL_SPACE + '!important'
+		} else if (typeof node.important === 'string') {
+			value += OPTIONAL_SPACE + '!' + lowercase(node.important)
 		}
 
 		return indent(indent_level) + property + COLON + OPTIONAL_SPACE + value
diff --git a/test/declarations.test.js b/test/declarations.test.js
index d987dab..3e9cd6d 100644
--- a/test/declarations.test.js
+++ b/test/declarations.test.js
@@ -89,4 +89,20 @@ test('!important is lowercase', () => {
 	assert.is(actual, expected)
 })
 
+test('browserhack !ie is printed', () => {
+	let actual = format(`a { color: green !ie}`)
+	let expected = `a {
+	color: green !ie;
+}`
+	assert.is(actual, expected)
+})
+
+test('browserhack !IE is lowercased', () => {
+	let actual = format(`a { color: green !IE}`)
+	let expected = `a {
+	color: green !ie;
+}`
+	assert.is(actual, expected)
+})
+
 test.run()