diff --git a/dist/jquery.localize.js b/dist/jquery.localize.js
index 90f65fc..eb9c511 100644
--- a/dist/jquery.localize.js
+++ b/dist/jquery.localize.js
@@ -41,16 +41,11 @@ http://keith-wood.name/localisation.html
           }
           break;
         case 2:
-          if (lang.length >= 2) {
-            file = "" + pkg + "-" + (lang.substring(0, 2)) + "." + fileExtension;
-            return jsonCall(file, pkg, lang, level);
-          }
-          break;
+          file = "" + pkg + "-" + (lang.split('-')[0]) + "." + fileExtension;
+          return jsonCall(file, pkg, lang, level);
         case 3:
-          if (lang.length >= 5) {
-            file = "" + pkg + "-" + (lang.substring(0, 5)) + "." + fileExtension;
-            return jsonCall(file, pkg, lang, level);
-          }
+          file = "" + pkg + "-" + (lang.split('-').slice(0, 2).join('-')) + "." + fileExtension;
+          return jsonCall(file, pkg, lang, level);
       }
     };
     jsonCall = function(file, pkg, lang, level) {
diff --git a/dist/jquery.localize.min.js b/dist/jquery.localize.min.js
index 999c0a8..195c491 100644
--- a/dist/jquery.localize.min.js
+++ b/dist/jquery.localize.min.js
@@ -1,4 +1,4 @@
-/*! Localize - v0.1.0 - 2015-08-21
+/*! Localize - v0.1.0 - 2016-08-26
  * https://github.com/coderifous/jquery-localize
- * Copyright (c) 2015 coderifous; Licensed MIT */
-!function(a){var b;return b=function(a){return a=a.replace(/_/,"-").toLowerCase(),a.length>3&&(a=a.substring(0,3)+a.substring(3).toUpperCase()),a},a.defaultLanguage=b(navigator.languages?navigator.languages[0]:navigator.language||navigator.userLanguage),a.localize=function(c,d){var e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u;return null==d&&(d={}),u=this,g={},f=d.fileExtension||"json",j=function(a,b,c){var e;switch(null==c&&(c=1),c){case 1:return g={},d.loadBase?(e=a+("."+f),h(e,a,b,c)):j(a,b,2);case 2:if(b.length>=2)return e=""+a+"-"+b.substring(0,2)+"."+f,h(e,a,b,c);break;case 3:if(b.length>=5)return e=""+a+"-"+b.substring(0,5)+"."+f,h(e,a,b,c)}},h=function(b,c,e,f){var h,i,k;return null!=d.pathPrefix&&(b=""+d.pathPrefix+"/"+b),k=function(b){return a.extend(g,b),p(g),j(c,e,f+1)},i=function(){return d.fallback&&d.fallback!==e?j(c,d.fallback):void 0},h={url:b,dataType:"json",async:!1,timeout:null!=d.timeout?d.timeout:500,success:k,error:i},"file:"===window.location.protocol&&(h.error=function(b){return k(a.parseJSON(b.responseText))}),a.ajax(h)},p=function(a){return null!=d.callback?d.callback(a,e):e(a)},e=function(b){return a.localize.data[c]=b,u.each(function(){var c,d,e;return c=a(this),d=c.data("localize"),d||(d=c.attr("rel").match(/localize\[(.*?)\]/)[1]),e=t(d,b),null!=e?k(c,d,e):void 0})},k=function(b,c,d){return b.is("input")?n(b,c,d):b.is("textarea")?n(b,c,d):b.is("img")?m(b,c,d):b.is("optgroup")?o(b,c,d):a.isPlainObject(d)||b.html(d),a.isPlainObject(d)?l(b,d):void 0},n=function(b,c,d){var e;return e=a.isPlainObject(d)?d.value:d,b.is("[placeholder]")?b.attr("placeholder",e):b.val(e)},l=function(a,b){return r(a,"title",b),r(a,"href",b),s(a,"text",b)},o=function(a,b,c){return a.attr("label",c)},m=function(a,b,c){return r(a,"alt",c),r(a,"src",c)},t=function(a,b){var c,d,e,f;for(c=a.split(/\./),d=b,e=0,f=c.length;f>e;e++)a=c[e],d=null!=d?d[a]:null;return d},r=function(a,b,c){return c=t(b,c),null!=c?a.attr(b,c):void 0},s=function(a,b,c){return c=t(b,c),null!=c?a.text(c):void 0},q=function(a){var b;return"string"==typeof a?"^"+a+"$":null!=a.length?function(){var c,d,e;for(e=[],c=0,d=a.length;d>c;c++)b=a[c],e.push(q(b));return e}().join("|"):a},i=b(d.language?d.language:a.defaultLanguage),d.skipLanguage&&i.match(q(d.skipLanguage))||j(c,i,1),u},a.fn.localize=a.localize,a.localize.data={}}(jQuery);
\ No newline at end of file
+ * Copyright (c) 2016 coderifous; Licensed MIT */
+!function(a){var b;return b=function(a){return a=a.replace(/_/,"-").toLowerCase(),a.length>3&&(a=a.substring(0,3)+a.substring(3).toUpperCase()),a},a.defaultLanguage=b(navigator.languages?navigator.languages[0]:navigator.language||navigator.userLanguage),a.localize=function(c,d){var e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u;return null==d&&(d={}),u=this,g={},f=d.fileExtension||"json",j=function(a,b,c){var e;switch(null==c&&(c=1),c){case 1:return g={},d.loadBase?(e=a+("."+f),h(e,a,b,c)):j(a,b,2);case 2:return e=""+a+"-"+b.split("-")[0]+"."+f,h(e,a,b,c);case 3:return e=""+a+"-"+b.split("-").slice(0,2).join("-")+"."+f,h(e,a,b,c)}},h=function(b,c,e,f){var h,i,k;return null!=d.pathPrefix&&(b=""+d.pathPrefix+"/"+b),k=function(b){return a.extend(g,b),p(g),j(c,e,f+1)},i=function(){return d.fallback&&d.fallback!==e?j(c,d.fallback):void 0},h={url:b,dataType:"json",async:!1,timeout:null!=d.timeout?d.timeout:500,success:k,error:i},"file:"===window.location.protocol&&(h.error=function(b){return k(a.parseJSON(b.responseText))}),a.ajax(h)},p=function(a){return null!=d.callback?d.callback(a,e):e(a)},e=function(b){return a.localize.data[c]=b,u.each(function(){var c,d,e;return c=a(this),d=c.data("localize"),d||(d=c.attr("rel").match(/localize\[(.*?)\]/)[1]),e=t(d,b),null!=e?k(c,d,e):void 0})},k=function(b,c,d){return b.is("input")?n(b,c,d):b.is("textarea")?n(b,c,d):b.is("img")?m(b,c,d):b.is("optgroup")?o(b,c,d):a.isPlainObject(d)||b.html(d),a.isPlainObject(d)?l(b,d):void 0},n=function(b,c,d){var e;return e=a.isPlainObject(d)?d.value:d,b.is("[placeholder]")?b.attr("placeholder",e):b.val(e)},l=function(a,b){return r(a,"title",b),r(a,"href",b),s(a,"text",b)},o=function(a,b,c){return a.attr("label",c)},m=function(a,b,c){return r(a,"alt",c),r(a,"src",c)},t=function(a,b){var c,d,e,f;for(c=a.split(/\./),d=b,e=0,f=c.length;f>e;e++)a=c[e],d=null!=d?d[a]:null;return d},r=function(a,b,c){return c=t(b,c),null!=c?a.attr(b,c):void 0},s=function(a,b,c){return c=t(b,c),null!=c?a.text(c):void 0},q=function(a){var b;return"string"==typeof a?"^"+a+"$":null!=a.length?function(){var c,d,e;for(e=[],c=0,d=a.length;d>c;c++)b=a[c],e.push(q(b));return e}().join("|"):a},i=b(d.language?d.language:a.defaultLanguage),d.skipLanguage&&i.match(q(d.skipLanguage))||j(c,i,1),u},a.fn.localize=a.localize,a.localize.data={}}(jQuery);
\ No newline at end of file
diff --git a/src/jquery.localize.coffee b/src/jquery.localize.coffee
index 98036ad..dfa6473 100644
--- a/src/jquery.localize.coffee
+++ b/src/jquery.localize.coffee
@@ -34,13 +34,11 @@ do ($ = jQuery) ->
           else
             loadLanguage(pkg, lang, 2)
         when 2
-          if lang.length >= 2
-            file = "#{pkg}-#{lang.substring(0, 2)}.#{fileExtension}"
-            jsonCall(file, pkg, lang, level)
+          file = "#{pkg}-#{lang.split('-')[0]}.#{fileExtension}"
+          jsonCall(file, pkg, lang, level)
         when 3
-          if lang.length >= 5
-            file = "#{pkg}-#{lang.substring(0, 5)}.#{fileExtension}"
-            jsonCall(file, pkg, lang, level)
+          file = "#{pkg}-#{lang.split('-').slice(0,2).join('-')}.#{fileExtension}"
+          jsonCall(file, pkg, lang, level)
 
     jsonCall = (file, pkg, lang, level) ->
       file = "#{options.pathPrefix}/#{file}" if options.pathPrefix?
diff --git a/test/lang/test-ast.json b/test/lang/test-ast.json
new file mode 100644
index 0000000..9f3835d
--- /dev/null
+++ b/test/lang/test-ast.json
@@ -0,0 +1,3 @@
+{
+  "basic": "basic success"
+}
diff --git a/test/localize_test.coffee b/test/localize_test.coffee
index c000fb8..064b567 100644
--- a/test/localize_test.coffee
+++ b/test/localize_test.coffee
@@ -149,6 +149,13 @@ do ($ = jQuery) ->
     t.localize("test", opts)
     equal t.text(), "country code success"
 
+  # Ref: https://github.com/coderifous/jquery-localize/issues/50
+  test "three-letter language code", ->
+    opts = language: "ast", pathPrefix: "lang"
+    t = localizableTagWithRel("p", "basic", text: "basic fail")
+    t.localize("test", opts)
+    equal t.text(), "basic success"
+
   module "Language optimization"
 
   test "skipping language using string match", ->
diff --git a/test/localize_test.js b/test/localize_test.js
index 9803a5b..07f0c9f 100644
--- a/test/localize_test.js
+++ b/test/localize_test.js
@@ -233,6 +233,18 @@
     t.localize("test", opts);
     return equal(t.text(), "country code success");
   });
+  test("three-letter language code", function() {
+    var opts, t;
+    opts = {
+      language: "ast",
+      pathPrefix: "lang"
+    };
+    t = localizableTagWithRel("p", "basic", {
+      text: "basic fail"
+    });
+    t.localize("test", opts);
+    return equal(t.text(), "basic success");
+  });
   module("Language optimization");
   test("skipping language using string match", function() {
     var opts, t;