diff --git a/setup.py b/setup.py
index 1fdce805..ffab7201 100755
--- a/setup.py
+++ b/setup.py
@@ -337,7 +337,7 @@
             'Source': 'https://github.com/lebigot/uncertainties'
         },
 
-        install_requires=['future'],
+        install_requires=["future; python_version < '3.1'"],
 
         tests_require=['nose', 'numpy'],