diff --git a/debian/control b/debian/control
index 0791faeebb0798aafd2ba27582ea982202089221..5ed191073680c65582a6bf4963cf633a05c453a9 100644
--- a/debian/control
+++ b/debian/control
@@ -4,7 +4,7 @@ Priority: extra
 Maintainer: Autistici/Inventati <debian@autistici.org>
 Build-Depends: debhelper (>= 5), apache2-prefork-dev | apache2-threaded-dev,
  autoconf, automake, libtool, python-dev, python-support, swig,
- libpam-dev, python-setuptools
+ libpam-dev, python-setuptools, python-flup
 Standards-Version: 3.7.2
 
 Package: ai-sso