diff --git a/src/selector.js b/src/selector.js
index 0cce515d..6b9152da 100644
--- a/src/selector.js
+++ b/src/selector.js
@@ -655,15 +655,15 @@ try {
 	// The workaround has to do additional checks after a getElementById
 	// Which slows things down for other browsers (hence the branching)
 	if ( !!document.getElementById( id ) ) {
-		Expr.find.ID = function(match, context){
-			if ( context.getElementById ) {
+		Expr.find.ID = function(match, context, isXML){
+			if ( typeof context.getElementById !== "undefined" && !isXML ) {
 				var m = context.getElementById(match[1]);
-				return m ? m.id === match[1] || m.getAttributeNode && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
+				return m ? m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
 			}
 		};
 
 		Expr.filter.ID = function(elem, match){
-			var node = elem.getAttributeNode && elem.getAttributeNode("id");
+			var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
 			return elem.nodeType === 1 && node && node.nodeValue === match;
 		};
 	}