diff --git a/python-tempora.changes b/python-tempora.changes
index 3c54e6f..02cb46c 100644
--- a/python-tempora.changes
+++ b/python-tempora.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Apr 14 09:12:12 UTC 2020 - Matej Cepl <mcepl@suse.com>
+
+- Don't use %python3_only command, but properly use alternatives.
+
 -------------------------------------------------------------------
 Thu Mar 26 11:21:36 UTC 2020 - pgajdos@suse.com
 
diff --git a/python-tempora.spec b/python-tempora.spec
index 85fe850..0c6a3d5 100644
--- a/python-tempora.spec
+++ b/python-tempora.spec
@@ -40,6 +40,8 @@ Requires:       python-pytz
 Requires:       python-setuptools
 Requires:       python-six
 BuildArch:      noarch
+Requires(post):   update-alternatives
+Requires(postun):  update-alternatives
 %python_subpackages
 
 %description
@@ -58,16 +60,23 @@ Modules include:
 
 %install
 %python_install
+%python_clone -a %{buildroot}%{_bindir}/calc-prorate
 %python_expand %fdupes %{buildroot}%{$python_sitelib}
 
 %check
 sed -i -e 's:--black::' -e 's:--cov::' -e 's/--flake8//g' pytest.ini
 %pytest
 
+%post
+%python_install_alternative calc-prorate
+
+%postun
+%python_uninstall_alternative calc-prorate
+
 %files %{python_files}
 %license LICENSE
 %doc CHANGES.rst README.rst docs/*rst
-%python3_only %{_bindir}/calc-prorate
+%python_alternative %{_bindir}/calc-prorate
 %{python_sitelib}/*
 
 %changelog