diff --git a/src/polymer-expressions.js b/src/polymer-expressions.js
index e3e14f4..9984c34 100644
--- a/src/polymer-expressions.js
+++ b/src/polymer-expressions.js
@@ -385,7 +385,7 @@
 
   PolymerExpressions.prototype = {
     getBinding: function(model, pathString, name, node) {
-      if (Path.isValid(pathString))
+      if (Path.get(pathString).valid)
         return; // bail out early if pathString is simple path.
 
       return getBinding(model, pathString, name, node);