diff --git a/picard/tagger.py b/picard/tagger.py
index 711b1d24b..29e5b3c08 100644
--- a/picard/tagger.py
+++ b/picard/tagger.py
@@ -206,9 +206,10 @@ class Tagger(QtGui.QApplication):
 
     def setup_gettext(self, localedir):
         """Setup locales, load translations, install gettext functions."""
-        if self.config.setting["ui_language"]:
+        ui_language = self.config.setting["ui_language"]
+        if ui_language:
             os.environ['LANGUAGE'] = ''
-            os.environ['LANG'] = self.config.setting["ui_language"]
+            os.environ['LANG'] = ui_language
         if sys.platform == "win32":
             try:
                 locale.setlocale(locale.LC_ALL, os.environ["LANG"])
@@ -221,6 +222,13 @@ class Tagger(QtGui.QApplication):
             except:
                 pass
         else:
+            if sys.platform == "darwin" and not ui_language:
+                try:
+                    import Foundation
+                    defaults = Foundation.NSUserDefaults.standardUserDefaults()
+                    os.environ["LANG"] = defaults.objectForKey_("AppleLanguages")[0]
+                except:
+                    pass
             try:
                 locale.setlocale(locale.LC_ALL, "")
             except:
diff --git a/setup.py b/setup.py
index 6e92e97c4..cdfe55c88 100755
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ try:
           'iconfile'       : 'picard.icns',
           'frameworks'     : ['libofa.0.dylib', 'libiconv.2.dylib', 'libdiscid.0.dylib'],
           'resources'      : ['locale'],
-          'includes'       : ['sip', 'PyQt4', 'picard.util.astrcmp', 'picard.musicdns.ofa', 'picard.musicdns.avcodec'],
+          'includes'       : ['sip', 'PyQt4', 'Foundation', 'picard.util.astrcmp', 'picard.musicdns.ofa', 'picard.musicdns.avcodec'],
           'excludes'       : ['pydoc', 'PyQt4.QtDeclarative', 'PyQt4.QtDesigner', 'PyQt4.QtHelp', 'PyQt4.QtMultimedia',
                               'PyQt4.QtOpenGL', 'PyQt4.QtScript', 'PyQt4.QtScriptTools', 'PyQt4.QtSql', 'PyQt4.QtSvg',
                               'PyQt4.QtTest', 'PyQt4.QtWebKit', 'PyQt4.QtXmlPatterns', 'PyQt4.phonon'],