diff --git a/src/apps.js b/src/apps.js
index f480820a4..2c123236d 100644
--- a/src/apps.js
+++ b/src/apps.js
@@ -176,6 +176,7 @@ function validatePortBindings(portBindings, tcpPorts) {
         2003, /* graphite (lo) */
         2004, /* graphite (lo) */
         2020, /* mail server */
+        2514, /* cloudron-syslog (lo) */
         config.get('port'), /* app server (lo) */
         config.get('sysadminPort'), /* sysadmin app server (lo) */
         config.get('smtpPort'), /* internal smtp port (lo) */
diff --git a/src/docker.js b/src/docker.js
index dedc5e8f8..fc967daff 100644
--- a/src/docker.js
+++ b/src/docker.js
@@ -183,7 +183,7 @@ function createSubcontainer(app, name, cmd, options, callback) {
                     Type: 'syslog',
                     Config: {
                         'tag': app.id,
-                        'syslog-address': 'udp://127.0.0.1:555',
+                        'syslog-address': 'udp://127.0.0.1:2514', // see apps.js:validatePortBindings()
                         'syslog-format': 'rfc5424'
                     }
                 },