diff --git a/contrib/systemd/acmed.service b/contrib/systemd/acmed.service
index 2c7dafa..7a9271f 100644
--- a/contrib/systemd/acmed.service
+++ b/contrib/systemd/acmed.service
@@ -28,7 +28,7 @@ ProtectClock=yes
 ProtectHostname=yes
 ProtectKernelTunables=yes
 ProtectKernelLogs=yes
-ProtectSystem=strict
+ProtectSystem=yes
 ReadWritePaths=/etc/acmed /var/lib/acmed
 RestrictRealtime=yes
 RestrictSUIDSGID=yes