diff --git a/openprocurement_client/utils.py b/openprocurement_client/utils.py
index a16c8f5..32fe93b 100644
--- a/openprocurement_client/utils.py
+++ b/openprocurement_client/utils.py
@@ -11,7 +11,7 @@
 from os import path
 from time import sleep, time
 import logging
-
+from past.builtins import basestring
 
 LOGGER = logging.getLogger()
 
diff --git a/setup.py b/setup.py
index 6924c24..b0fb154 100644
--- a/setup.py
+++ b/setup.py
@@ -43,10 +43,11 @@
         'python-magic',
         'bottle',
         'mock',
-        'nose'
+        'nose',
+        'future'
         # -*- Extra requirements: -*-
     ],
-    tests_require=tests_require,
+    tests_require=tests_require['test'],
     extras_require=tests_require,
     entry_points="""
     # -*- Entry points: -*-