diff --git a/requirements.txt b/requirements.txt
index c1f4b9082..703dc6341 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ jsonrpclib
 Jinja2
 kombu>=2.4.8
 netaddr>=0.7.6
+psutil>=0.6.1,<1.0
 python-neutronclient>=2.3.0,<3
 SQLAlchemy>=0.7.8,<=0.7.99
 WebOb>=1.2.3,<1.3