diff --git a/btrfsmaintenance.changes b/btrfsmaintenance.changes
index 8a8b4fd..b45c1d5 100644
--- a/btrfsmaintenance.changes
+++ b/btrfsmaintenance.changes
@@ -1,3 +1,13 @@
+-------------------------------------------------------------------
+Fri Nov 10 22:12:08 UTC 2017 - antoine.belvire@opensuse.org
+
+- Fix cron symlinks removal upon package upgrade (boo#904518):
+  * The problem was in the preun section (in the old RPM).
+  * This means the symlinks are removed by this update, but won't
+    be by the next ones.
+  * Please run 'systemctl start btrfsmaintenance-refresh' one more
+    time to fix your symlinks.
+
 -------------------------------------------------------------------
 Tue Nov  7 22:06:55 UTC 2017 - antoine.belvire@opensuse.org
 
diff --git a/btrfsmaintenance.spec b/btrfsmaintenance.spec
index a7ead79..4162c43 100644
--- a/btrfsmaintenance.spec
+++ b/btrfsmaintenance.spec
@@ -95,7 +95,12 @@ install -m 644 -D sysconfig.btrfsmaintenance %{buildroot}%{_localstatedir}/adm/f
 
 %preun
 %service_del_preun btrfsmaintenance-refresh.service
-%{_datadir}/%{name}/btrfsmaintenance-refresh-cron.sh uninstall
+if [ $1 -eq 0 ]; then
+  # Remove cron files in %%preun only if it's a package removal.
+  # If it's an upgrade, the %%post section of the new package has
+  # already refreshed the cron links, so we shall not remove them.
+  %{_datadir}/%{name}/btrfsmaintenance-refresh-cron.sh uninstall
+fi
 
 %postun
 %service_del_postun btrfsmaintenance-refresh.service
@@ -104,7 +109,9 @@ install -m 644 -D sysconfig.btrfsmaintenance %{buildroot}%{_localstatedir}/adm/f
 %if 0%{?suse_version} < 1210
 
 %preun
-%{_datadir}/%{name}/btrfsmaintenance-refresh-cron.sh uninstall
+if [ $1 -eq 0 ]; then
+  %{_datadir}/%{name}/btrfsmaintenance-refresh-cron.sh uninstall
+fi
 %endif
 
 %files