diff --git a/punycode.js b/punycode.js
index 752b98a..ac9d577 100644
--- a/punycode.js
+++ b/punycode.js
@@ -14,7 +14,7 @@ const initialN = 128; // 0x80
 const delimiter = '-'; // '\x2D'
 
 /** Regular expressions */
-const regexPunycode = /^xn--/;
+const regexPunycode = /^xn--/i;
 const regexNonASCII = /[^\0-\x7F]/; // Note: U+007F DEL is excluded too.
 const regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
 
@@ -389,7 +389,7 @@ const encode = function(input) {
 const toUnicode = function(input) {
 	return mapDomain(input, function(string) {
 		return regexPunycode.test(string)
-			? decode(string.slice(4).toLowerCase())
+			? decode(string.slice(4))
 			: string;
 	});
 };
diff --git a/tests/tests.js b/tests/tests.js
index ced85a0..24fef56 100644
--- a/tests/tests.js
+++ b/tests/tests.js
@@ -190,6 +190,14 @@ const testData = {
 			'decoded': 'caf\xE9.com',
 			'encoded': 'xn--caf-dma.com'
 		},
+		{
+			'decoded': 'ÜBER.COM',
+			'encoded': 'xn--BER-ska.COM'
+		},
+		{
+			'decoded': 'sPhÈRè.com',
+			'encoded': 'xn--sPhR-nka7q.com'
+		},
 		{
 			'decoded': '\u2603-\u2318.com',
 			'encoded': 'xn----dqo34k.com'