diff --git a/plinth/modules/calibre/data/usr/lib/systemd/system/calibre-server-freedombox.service b/plinth/modules/calibre/data/usr/lib/systemd/system/calibre-server-freedombox.service
index 0ac7a7026..df6acfacd 100644
--- a/plinth/modules/calibre/data/usr/lib/systemd/system/calibre-server-freedombox.service
+++ b/plinth/modules/calibre/data/usr/lib/systemd/system/calibre-server-freedombox.service
@@ -4,6 +4,7 @@
 Description=calibre Content Server
 Documentation=man:calibre-server(1)
 After=network.target
+ConditionPathExists=/usr/bin/calibre-server
 
 [Service]
 CapabilityBoundingSet=~CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_CHOWN CAP_FSETID CAP_SETFCAP CAP_DAC_OVERRIDE CAP_DAC_READ_SEARCH CAP_FOWNER CAP_IPC_OWNER CAP_NET_ADMIN CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE CAP_KILL CAP_NET_BIND_SERVICE CAP_NET_RAW CAP_LINUX_IMMUTABLE CAP_IPC_LOCK CAP_SYS_CHROOT CAP_BLOCK_SUSPEND CAP_LEASE CAP_SYS_PACCT CAP_SYS_TTY_CONFIG CAP_SYS_BOOT CAP_MAC_ADMIN CAP_MAC_OVERRIDE CAP_SYS_NICE CAP_SYS_RESOURCE