diff --git a/lib/types/json-api.js b/lib/types/json-api.js
index d6e3ae72..378b74c7 100644
--- a/lib/types/json-api.js
+++ b/lib/types/json-api.js
@@ -146,8 +146,9 @@ SubDoc.prototype.push = function(path, value, cb) {
   return normalizeArgs(this, arguments, function(path, value, cb) {
       var _ref = traverse(this.context.getSnapshot(), path);
       var len = _ref.elem[_ref.key].length;
-      path.push(len);
-    return this.context.insert(path, value, cb);
+      var newpath = path.slice();
+      newpath.push(len);
+    return this.context.insert(newpath, value, cb);
   });
 };