diff --git a/python-vdirsyncer.changes b/python-vdirsyncer.changes
index cf0df99..0913ea6 100644
--- a/python-vdirsyncer.changes
+++ b/python-vdirsyncer.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Mar 12 19:57:06 UTC 2021 - Matej Cepl <mcepl@suse.com>
+
+- Set up update-alternatives for systemd unit files.
+
 -------------------------------------------------------------------
 Sun Feb 28 22:24:56 UTC 2021 - Hans-Peter Jansen <hpj@urpla.net>
 
diff --git a/python-vdirsyncer.spec b/python-vdirsyncer.spec
index 7371400..1c19020 100644
--- a/python-vdirsyncer.spec
+++ b/python-vdirsyncer.spec
@@ -46,7 +46,7 @@ Requires:       python-click-threading >= 0.2
 Requires:       python-requests >= 2.20.0
 Requires:       python-requests-toolbelt >= 0.4.0
 Requires(post): update-alternatives
-Requires(postun): update-alternatives
+Requires(postun):update-alternatives
 Recommends:     python-requests-oauthlib
 BuildArch:      noarch
 # SECTION test requirements
@@ -84,11 +84,15 @@ rm -rf vdirsyncer.egg-info
 %install
 %python_install
 %python_clone -a %{buildroot}%{_bindir}/vdirsyncer
-%python_expand %fdupes %{buildroot}/%{$python_sitelib}
 
 mkdir -p %{buildroot}%{_userunitdir}
-install -Dpm 0644 %{SOURCE1} %{buildroot}%{_userunitdir}/vdirsyncer.service
-install -Dpm 0644 %{SOURCE2} %{buildroot}%{_userunitdir}/vdirsyncer.timer
+%{python_expand \
+install -Dpm 0644 %{SOURCE1} %{buildroot}%{_userunitdir}/vdirsyncer-%{$python_bin_suffix}.service
+install -Dpm 0644 %{SOURCE2} %{buildroot}%{_userunitdir}/vdirsyncer-%{$python_bin_suffix}.timer
+%fdupes %{buildroot}/%{$python_sitelib}
+}
+%prepare_alternative -t %{_userunitdir}/vdirsyncer.service vdirsyncer.service
+%prepare_alternative -t %{_userunitdir}/vdirsyncer.timer vdirsyncer.timer
 
 %check
 export DETERMINISTIC_TESTS=true
@@ -96,7 +100,10 @@ export DETERMINISTIC_TESTS=true
 %pytest -k 'not test_legacy_status and not test_open_graphical_browser and not test_verbosity'
 
 %post
-%python_install_alternative vdirsyncer
+update-alternatives --install %{_bindir}/vdirsyncer vdirsyncer %{_bindir}/vdirsyncer-%{python_bin_suffix} %{python_version_nodots} \
+   --slave %{_userunitdir}/vdirsyncer.service vdirsyncer.service %{_userunitdir}/vdirsyncer-%{python_bin_suffix}.service \
+   --slave %{_userunitdir}/vdirsyncer.timer vdirsyncer.timer %{_userunitdir}/vdirsyncer-%{python_bin_suffix}.timer
+update-alternatives --auto vdirsyncer
 
 %postun
 %python_uninstall_alternative vdirsyncer
@@ -105,8 +112,11 @@ export DETERMINISTIC_TESTS=true
 %doc README.rst
 %license LICENSE
 %python_alternative %{_bindir}/vdirsyncer
-%{python_sitelib}/*
+%{python_sitelib}/vdirsyncer*
+%{_userunitdir}/vdirsyncer-%{python_bin_suffix}.service
+%{_userunitdir}/vdirsyncer-%{python_bin_suffix}.timer
 %{_userunitdir}/vdirsyncer.service
 %{_userunitdir}/vdirsyncer.timer
+%ghost %{_sysconfdir}/alternatives/vdirsyncer*
 
 %changelog