diff --git a/source/Ox/js/Type.js b/source/Ox/js/Type.js
index 4b93f881..bd895ab7 100644
--- a/source/Ox/js/Type.js
+++ b/source/Ox/js/Type.js
@@ -4,10 +4,10 @@
 Ox.checkType <f> Throws a TypeError if a value is not of a given type
     (val, type) -> <u> undefined
     val <*> Any value
-    type <s> Type
+    type <s|[s]> Type, or array of types
 @*/
 Ox.checkType = function(val, type) {
-    if (!Ox.in(Ox.toArray(type), Ox.typeOf(val))) {
+    if (!Ox.in(Ox.makeArray(type), Ox.typeOf(val))) {
         throw new TypeError();
     }
 };