diff --git a/lib/CssSelector.js b/lib/CssSelector.js
index aa58a2f..140b51f 100644
--- a/lib/CssSelector.js
+++ b/lib/CssSelector.js
@@ -137,7 +137,7 @@ ElementSelector.prototype = {
 
 		var selector = this.tag;
 		if (this.id !== null) {
-			selector += '#' + this.id;
+			selector += "[id='" + this.id + "']";
 		}
 		if (this.classes.length) {
 			for (var i = 0; i < this.classes.length; i++) {