diff --git a/lasso.spec b/lasso.spec
index 1f9cc05..255dac5 100644
--- a/lasso.spec
+++ b/lasso.spec
@@ -26,6 +26,7 @@ BuildRequires: gtk-doc, libtool-ltdl-devel
 BuildRequires: glib2-devel, swig
 BuildRequires: libxml2-devel, xmlsec1-devel, openssl-devel, xmlsec1-openssl-devel
 BuildRequires: libtool
+BuildRequires: python-six
 Url: http://lasso.entrouvert.org/
 
 %description