diff --git a/systemd/mpd.service.in b/systemd/mpd.service.in
index bb7b5802a..c4600406d 100644
--- a/systemd/mpd.service.in
+++ b/systemd/mpd.service.in
@@ -19,6 +19,9 @@ ControlGroup=cpu:/mpd
 # assign a real-time budget
 ControlGroupAttribute=cpu.rt_runtime_us 500000
 
+# disallow writing to /usr, /bin, /sbin, ...
+ProtectSystem=yes
+
 [Install]
 WantedBy=multi-user.target
 Also=mpd.socket