diff --git a/src/symbol.js b/src/symbol.js
index 24ca9ff..073cbab 100644
--- a/src/symbol.js
+++ b/src/symbol.js
@@ -24,7 +24,7 @@ import {PLATFORM} from 'aurelia-pal';
     create = Object.create,
     keys = Object.keys,
     defineProperty = Object[DP],
-    defineProperties = Object[DPies],
+    $defineProperties = Object[DPies],
     descriptor = gOPD(Object, GOPN),
     ObjectProto = Object.prototype,
     hOP = ObjectProto.hasOwnProperty,
@@ -145,8 +145,8 @@ import {PLATFORM} from 'aurelia-pal';
           $defineProperty(o, uid, descriptors[uid]);
         }
       });
-    } else {
-      defineProperties(o, descriptors);
+    } else {
+      $defineProperties(o, descriptors);
     }
     return o;
   };