diff --git a/python-mock.spec b/python-mock.spec
index 4dc960f..e2cd39a 100644
--- a/python-mock.spec
+++ b/python-mock.spec
@@ -8,7 +8,7 @@
 
 Name:           python-mock
 Version:        3.0.5
-Release:        11%{?dist}
+Release:        12%{?dist}
 Summary:        A Python Mocking and Patching Library for Testing
 
 License:        BSD
@@ -21,6 +21,7 @@ BuildRequires:  python%{python3_pkgversion}-devel
 BuildRequires:  python%{python3_pkgversion}-setuptools
 %if %{with tests}
 BuildRequires:  python%{python3_pkgversion}-pytest
+BuildRequires:  python%{python3_pkgversion}-six
 %endif
 
 
@@ -69,6 +70,9 @@ needed attributes in the normal way.
 
 
 %changelog
+* Mon Dec 07 2020 Miro Hrončok <mhroncok@redhat.com> - 3.0.5-12
+- BuildRequire six to fix a build failure
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.0.5-11
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild