diff --git a/chrome/content/zotero/charsetMenu.js b/chrome/content/zotero/charsetMenu.js
index 97b3622b3..c697ade75 100644
--- a/chrome/content/zotero/charsetMenu.js
+++ b/chrome/content/zotero/charsetMenu.js
@@ -20,7 +20,7 @@
     ***** END LICENSE BLOCK *****
 */
 
-Zotero_Charset_Menu = new function() {
+var Zotero_Charset_Menu = new function() {
 	this.populate = populate;
 	
 	/**
diff --git a/chrome/content/zotero/preferences/preferences.js b/chrome/content/zotero/preferences/preferences.js
index a3b199034..14e27f6c3 100644
--- a/chrome/content/zotero/preferences/preferences.js
+++ b/chrome/content/zotero/preferences/preferences.js
@@ -40,8 +40,10 @@ function init()
 	initSearchPane();
 	
 	var charsetMenu = document.getElementById("zotero-import-charsetMenu");
-	charsetMap = Zotero_Charset_Menu.populate(charsetMenu, false);
-	charsetMenu.selectedItem = charsetMap[Zotero.Prefs.get("import.charset")] ? charsetMap[Zotero.Prefs.get("import.charset")] : charsetMap["auto"];
+	var charsetMap = Zotero_Charset_Menu.populate(charsetMenu, false);
+	charsetMenu.selectedItem =
+		charsetMap[Zotero.Prefs.get("import.charset")] ?
+			charsetMap[Zotero.Prefs.get("import.charset")] : charsetMap["auto"];
 }