diff --git a/chrome/content/zotero/preferences/preferences_advanced.js b/chrome/content/zotero/preferences/preferences_advanced.js
index 53767cd9d7..4dad20253a 100644
--- a/chrome/content/zotero/preferences/preferences_advanced.js
+++ b/chrome/content/zotero/preferences/preferences_advanced.js
@@ -627,7 +627,7 @@ Zotero_Preferences.Advanced = {
 	},
 	
 	onLocaleChange: function () {
-		var requestedLocale = Services.locale.getRequestedLocale();
+		var requestedLocale = Services.locale.requestedLocale;
 		var menu = document.getElementById('locale-menu');
 		
 		if (menu.value == 'automatic') {
@@ -636,12 +636,12 @@ Zotero_Preferences.Advanced = {
 			var changed = requestedLocale
 				&& requestedLocale == Zotero.locale
 				&& menu.label != this._getAutomaticLocaleMenuLabel();
-			Services.locale.setRequestedLocales(null);
+			Services.locale.requestedLocales = null;
 		}
 		else {
 			// Changed if moving to a locale other than the current one
 			var changed = requestedLocale != menu.value
-			Services.locale.setRequestedLocales([menu.value]);
+			Services.locale.requestedLocales = [menu.value];
 		}
 		
 		if (!changed) {
diff --git a/chrome/content/zotero/xpcom/intl.js b/chrome/content/zotero/xpcom/intl.js
index ee4fb3b4ba..a09560ae19 100644
--- a/chrome/content/zotero/xpcom/intl.js
+++ b/chrome/content/zotero/xpcom/intl.js
@@ -38,7 +38,7 @@ Zotero.Intl = new function () {
 			let restart = false;
 			if (prevMatchOS === false && prevLocale) {
 				try {
-					Services.locale.setRequestedLocales([prevLocale]);
+					Services.locale.requestedLocales = [prevLocale];
 					restart = true;
 				}
 				catch (e) {
diff --git a/test/tests/utilities_internalTest.js b/test/tests/utilities_internalTest.js
index 2e27ec6470..ba1fbea59d 100644
--- a/test/tests/utilities_internalTest.js
+++ b/test/tests/utilities_internalTest.js
@@ -397,7 +397,7 @@ describe("Zotero.Utilities.Internal", function () {
 		var availableLocales;
 		
 		before(function () {
-			availableLocales = Services.locale.getAvailableLocales();
+			availableLocales = Services.locale.availableLocales;
 		});
 		
 		function resolve(locale) {