diff --git a/src/animation/PropertyBinding.js b/src/animation/PropertyBinding.js
index 26e6d776c02cfe42e0a163aaccc840b940ed6151..9861f6d53096b10aca445542b8d099b4bbda713f 100644
--- a/src/animation/PropertyBinding.js
+++ b/src/animation/PropertyBinding.js
@@ -237,7 +237,7 @@ PropertyBinding.prototype = {
 
 			this.resolvedProperty = nodeProperty;
 
-		} else if ( nodeProperty.length !== undefined ) {
+		} else if ( Array.isArray( nodeProperty ) ) {
 
 			bindingType = this.BindingType.EntireArray;