diff --git a/chrome/content/zotero/xpcom/utilities.js b/chrome/content/zotero/xpcom/utilities.js
index a6089a370..9ea6a6f4e 100644
--- a/chrome/content/zotero/xpcom/utilities.js
+++ b/chrome/content/zotero/xpcom/utilities.js
@@ -661,7 +661,9 @@ Zotero.Utilities.Translate.prototype.getVersion = function() {
 Zotero.Utilities.Translate.prototype.gatherElementsOnXPath = function(doc, parentNode, xpath, nsResolver) {
 	var elmts = [];
 	
-	var iterator = doc.evaluate(xpath, parentNode, nsResolver, Components.interfaces.nsIDOMXPathResult.ANY_TYPE,null);
+	var iterator = doc.evaluate(xpath, parentNode, nsResolver,
+		(Zotero.isFx ? Components.interfaces.nsIDOMXPathResult.ANY_TYPE : XPathResult.ANY_TYPE),
+		null);
 	var elmt = iterator.iterateNext();
 	var i = 0;
 	while (elmt) {