diff --git a/pydu/__init__.py b/pydu/__init__.py
index 42e62e7..c92b5e1 100644
--- a/pydu/__init__.py
+++ b/pydu/__init__.py
@@ -1,6 +1,7 @@
 """
 Useful data structures, utils for Python.
 """
+from __future__ import absolute_import
 
 __version__ = '0.5.0'
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 422c09e..233c0f5 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,4 @@
 pytest>=2.8.0
 pytest-xdist
-coverage
\ No newline at end of file
+coverage
+psutil