diff --git a/chrony.spec b/chrony.spec
index 198c2d6..a703e11 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -157,6 +157,14 @@ getent passwd chrony > /dev/null || /usr/sbin/useradd -r -g chrony \
 :
 
 %post
+# fix PIDFile in local chronyd.service on upgrades from chrony < 3.3-2
+if grep -q 'PIDFile=%{_localstatedir}/run/chronyd.pid' \
+                %{_sysconfdir}/systemd/system/chronyd.service 2> /dev/null && \
+        ! grep -qi '^[ '$'\t'']*pidfile' %{_sysconfdir}/chrony.conf 2> /dev/null
+then
+        sed -i '/PIDFile=/s|/run/|/run/chrony/|' \
+                %{_sysconfdir}/systemd/system/chronyd.service
+fi
 %systemd_post chronyd.service chrony-wait.service
 
 %preun