diff --git a/debian/prometheus-entrouvert-exporter.postinst b/debian/prometheus-entrouvert-exporter.postinst
index 59815b0..f90bc59 100644
--- a/debian/prometheus-entrouvert-exporter.postinst
+++ b/debian/prometheus-entrouvert-exporter.postinst
@@ -5,7 +5,7 @@ set -e
 case "$1" in
   configure)
     # remove obsolete timer
-    test -e /etc/systemd/system/timers.target.wants/prometheus-entrouvert-exporter.timer && systemctl disable prometheus-entrouvert-exporter.timer
+    test -L /etc/systemd/system/timers.target.wants/prometheus-entrouvert-exporter.timer && systemctl disable prometheus-entrouvert-exporter.timer
   ;;
 
   abort-upgrade|abort-remove|abort-deconfigure|triggered)