diff --git a/messages/da-DK.json b/messages/da-DK.json
index 9ff9d3809..f78b08839 100644
--- a/messages/da-DK.json
+++ b/messages/da-DK.json
@@ -2717,6 +2717,7 @@
     "healthScheme": "Metode",
     "healthSelectScheme": "Vælg metode",
     "healthCheckPortInvalid": "Porten skal være mellem 1 og 65535",
+    "healthCheckHostnameInvalid": "Hostname must not contain whitespace",
     "healthCheckPath": "Sti",
     "healthHostname": "IP / Vært",
     "healthPort": "Port",