diff --git a/index.js b/index.js
index 5a9c186..91190fa 100644
--- a/index.js
+++ b/index.js
@@ -4,15 +4,18 @@ var isString = function(s){
     return typeof(s) === 'string';
 };
 
-function parse(al){
+function parse(al, mapLocale){
     var strings = (al || "").match(regex);
+    mapLocale = mapLocale || function (x) { return x; };
+
     return strings.map(function(m){
         if(!m){
             return;
         }
 
         var bits = m.split(';');
-        var ietf = bits[0].split('-');
+        var ietf = mapLocale(bits[0]);
+        ietf = ietf.split('-');
         var hasScript = ietf.length === 3;
 
         return {
@@ -28,6 +31,32 @@ function parse(al){
         });
 }
 
+// zh-CN = Simplified script with Mandarin grammar = Chinese as written in China
+// zh-TW = Traditional script with Mandarin grammar = Chinese as written in Taiwan
+// zh-HK = Traditional script with Cantonese grammar = Chinese as written in Hong Kong
+
+var newLocales = {
+    // https://docs.microsoft.com/en-us/previous-versions/dotnet/netframework-4.0/dd997383(v=vs.100)
+    'zh-cht': 'zh-Hant',
+    'zh-chs': 'zh-Hans',
+
+    'zh-tw': 'zh-Hant-TW',
+    'zh-hk': 'zh-Hant-HK',
+    'zh-mo': 'zh-Hant-MO',
+
+    // https://gist.github.com/amake/0ac7724681ac1c178c6f95a5b09f03ce
+    'zh-sg': 'zh-Hans-SG',
+    'zh-cn': 'zh-Hans-CN'
+};
+
+function mapLocalesDefault(oldLocale) {
+    // some apps use  "_" instead of "-".
+    var newLocale = oldLocale.toLowerCase().replace(/_/g, '-');
+    newLocale = newLocales[newLocale] || newLocale;
+    // console.log(oldLocale, newLocale);
+    return newLocale;
+}
+
 function pick(supportedLanguages, acceptLanguage, options){
     options = options || {};
 
@@ -36,7 +65,7 @@ function pick(supportedLanguages, acceptLanguage, options){
     }
 
     if(isString(acceptLanguage)){
-        acceptLanguage = parse(acceptLanguage);
+        acceptLanguage = parse(acceptLanguage, options.mapLocales || mapLocalesDefault);
     }
 
     var supported = supportedLanguages.map(function(support){
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..7f6836b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1272 @@
+{
+  "name": "accept-language-parser",
+  "version": "1.5.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "ajv": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
+      }
+    },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "safer-buffer": "2.1.2"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
+    "async": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+      "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
+      "dev": true,
+      "optional": true
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true,
+      "optional": true
+    },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true,
+      "optional": true
+    },
+    "aws4": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
+      "dev": true,
+      "optional": true
+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "requires": {
+        "balanced-match": "1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
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+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
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+      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
+      "dev": true,
+      "optional": true
+    },
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+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true,
+      "optional": true
+    },
+    "cli": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cli/-/cli-1.0.1.tgz",
+      "integrity": "sha1-IoF1NPJL+klQw01TLUjsvGIbjBQ=",
+      "dev": true,
+      "requires": {
+        "exit": "0.1.2",
+        "glob": "7.1.2"
+      }
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+    "co": {
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+      "dev": true,
+      "optional": true
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+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+      "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
+      "dev": true,
+      "optional": true
+    },
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+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+      "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+      "dev": true,
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+      }
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+    "commander": {
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+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+      "dev": true,
+      "requires": {
+        "graceful-readlink": "1.0.1"
+      }
+    },
+    "concat-map": {
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+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
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+        },
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+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
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+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
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+}
diff --git a/tests/tests.js b/tests/tests.js
index 34c0f09..36f307b 100644
--- a/tests/tests.js
+++ b/tests/tests.js
@@ -159,4 +159,42 @@ describe('accept-language#pick()', function(){
         var result = parser.pick(['en-US', 'en', 'pl'], 'en-US;q=0.6', { loose: true });
         assert.equal(result, 'en-US');
     });
+
+    it('should map zh-CHT => zh-Hant: Traditional Chinese', function(){
+        var result = parser.pick(['zh-Hans', 'zh-Hant-CN', 'zh-Hant'], 'zh-CHT,zh-cn;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hant');
+    });
+
+    it('should map zh-TW => zh-Hant-TW: Traditional Chinese / Taiwan', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans-SG', 'zh-Hans', 'zh-Hant-TW'], 'zh-TW;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hant-TW');
+    });
+
+    it('should map zh-HK => zh-Hant-HK: Traditional Chinese / Hong Kong', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans-SG', 'zh-Hans', 'zh-Hant-HK', 'zh-Hant-TW'],
+             'zh-HK;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hant-HK');
+    });
+
+    it('should map zh-MO => zh-Hant-MO: Traditional Chinese / Macau', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans-SG', 'zh-Hans', 'zh-Hant-TW', 'zh-Hant-MO'],
+        'zh-MO;q=0.8,zh-TW;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hant-MO');
+    });
+
+    it('should map zh-CHS to zh-Hans: Simplified Chinese', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans', 'zh-Hans'], 'zh-CHS,zh-cn;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hans');
+    });
+
+    it('should map zh-cn => zh-Hans-CN: Simplied Chinese / China', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans-SG', 'zh-Hans', 'zh-Hant'], 'zh-cn;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hans-CN');
+    });
+
+    it('should map zh-sg => zh-Hans-SG: Simplied Chinese / Singapore', function(){
+        var result = parser.pick(['zh-Hans-CN', 'zh-Hans-SG', 'zh-Hans', 'zh-Hant'], 'zh-sg;q=0.6,zh;q=0.4');
+        assert.equal(result, 'zh-Hans-SG');
+    });
+
 });