diff --git a/requirements.txt b/requirements.txt
index fdb60856..332a381c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,6 @@
 requests >= 2.4
 pyxdg
 dnspython
+future
 # optional:
 argcomplete
diff --git a/setup.py b/setup.py
index ae5f53fc..382ae007 100755
--- a/setup.py
+++ b/setup.py
@@ -504,6 +504,7 @@ args = dict(
         'requests >= 2.4',
         'dnspython',
         'pyxdg',
+        'future',
     ],
     # Commented out since they are untested and not officially supported.
     # See also doc/install.txt for more detailed dependency documentation.