diff --git a/python-bcrypt.changes b/python-bcrypt.changes
index 6dd21de..532bb73 100644
--- a/python-bcrypt.changes
+++ b/python-bcrypt.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Oct  5 11:57:45 UTC 2016 - dmueller@suse.com
+
+- require the cffi version it was built against
+
 -------------------------------------------------------------------
 Thu Sep 29 20:53:41 UTC 2016 - mardnh@gmx.de
 
diff --git a/python-bcrypt.spec b/python-bcrypt.spec
index cc67a5c..d3ed332 100644
--- a/python-bcrypt.spec
+++ b/python-bcrypt.spec
@@ -1,6 +1,7 @@
 #
 # spec file for package python-bcrypt
 #
+# Copyright (c) 2016 SUSE LINUX GmbH, Nuernberg, Germany.
 # Copyright (c) 2016, Martin Hauke <mardnh@gmx.de>
 #
 # All modifications and additions to the file contributed by third parties
@@ -25,12 +26,14 @@ Group:          Development/Languages/Python
 Url:            https://github.com/pyca/bcrypt/
 Source:         https://pypi.io/packages/source/b/bcrypt/bcrypt-%{version}.tar.gz
 BuildRequires:  fdupes
-BuildRequires:  pkgconfig(libffi)
 BuildRequires:  python-cffi
 BuildRequires:  python-devel
 BuildRequires:  python-pytest
 BuildRequires:  python-setuptools
 BuildRequires:  python-six
+BuildRequires:  pkgconfig(libffi)
+Requires:       python-six
+%requires_eq    python-cffi
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description