diff --git a/systemd_units/caddy.service b/systemd_units/caddy.service
index f14c0dd..c85c91f 100644
--- a/systemd_units/caddy.service
+++ b/systemd_units/caddy.service
@@ -29,7 +29,7 @@ ProtectControlGroups=true
 ProtectKernelModules=true
 ProtectKernelTunables=true
 PrivateDevices=true
-RestrictAddressFamilies=AF_INET AF_INET6
+RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
 RestrictNamespaces=true
 RestrictRealtime=true
 SystemCallArchitectures=native