diff --git a/trains_agent/helper/package/requirements.py b/trains_agent/helper/package/requirements.py
index 03a58ca..ee981ca 100644
--- a/trains_agent/helper/package/requirements.py
+++ b/trains_agent/helper/package/requirements.py
@@ -4,7 +4,7 @@ import operator
 import os
 import re
 from abc import ABCMeta, abstractmethod
-from copy import deepcopy
+from copy import deepcopy, copy
 from itertools import chain, starmap
 from operator import itemgetter
 from os import path
@@ -81,6 +81,9 @@ class MarkerRequirement(object):
 
         return ''.join(parts)
 
+    def clone(self):
+        return MarkerRequirement(copy(self.req))
+
     __str__ = tostr
 
     def __repr__(self):