diff --git a/requirements.txt b/requirements.txt
index 3199d2ec565..152299887a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,3 +52,4 @@ WebOb>=1.2.3
 oslo.i18n>=1.5.0 # Apache-2.0
 oslo.vmware>=1.16.0 # Apache-2.0
 os-brick>=0.4.0 # Apache-2.0
+os-win>=0.0.6 # Apache-2.0