diff --git a/stack/erp5.cfg b/stack/erp5.cfg
index 4275c60e6811b3127523e626b765aaca12612d23..83c54f939c9ecff34e673647d0bff395ac8d250e 100644
--- a/stack/erp5.cfg
+++ b/stack/erp5.cfg
@@ -578,3 +578,4 @@ facebook-sdk = 0.3.1
 google-api-python-client = 1.0c2
 httplib2 = 0.7.4
 qrcode = 2.4.1
+python-gflags = 2.0