diff --git a/lib/cast.js b/lib/cast.js
index a2c9777628a..7f475edfeb4 100644
--- a/lib/cast.js
+++ b/lib/cast.js
@@ -255,7 +255,7 @@ module.exports = function cast(schema, obj, options, context) {
             }
           }
         }
-      } else if (val.constructor.name === 'Array' && ['Buffer', 'Array'].indexOf(schematype.instance) === -1) {
+      } else if (Array.isArray(val) && ['Buffer', 'Array'].indexOf(schematype.instance) === -1) {
         var casted = [];
         for (var valIndex = 0; valIndex < val.length; valIndex++) {
           casted.push(schematype.castForQueryWrapper({