diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index b0af143ee0..4a5767b78b 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -257,8 +257,18 @@ const ZOTERO_CONFIG = {
 		
 		// Locale
 		var prefs = Components.classes["@mozilla.org/preferences-service;1"]
-						.getService(Components.interfaces.nsIPrefService);
-		this.locale = prefs.getBranch("general.useragent.").getCharPref("locale");
+						.getService(Components.interfaces.nsIPrefService),
+			uaPrefs = prefs.getBranch("general.useragent.");
+		try {
+			this.locale = uaPrefs.getComplexValue("locale", Components.interfaces.nsIPrefLocalizedString);
+		} catch (e) {}
+		
+		if(this.locale) {
+			this.locale = this.locale.toString();
+		} else {
+			this.locale = uaPrefs.getCharPref("locale");
+		}
+		
 		if (this.locale.length == 2) {
 			this.locale = this.locale + '-' + this.locale.toUpperCase();
 		}