diff --git a/scripts/pi-hole/js/messages.js b/scripts/pi-hole/js/messages.js
index 124a69e2..a3010a24 100644
--- a/scripts/pi-hole/js/messages.js
+++ b/scripts/pi-hole/js/messages.js
@@ -57,6 +57,22 @@ function renderMessage(data, type, row) {
         "</pre> to get the group configuration for this client."
       );
 
+    case "HOSTNAME":
+      var hint = new Array(row.blob2 + row.message.length + 3).join(" ");
+      return (
+        "Hostname contains invalid character <code>" +
+        decodeURIComponent(escape(row.blob1))[row.blob2] +
+        "</code>:<pre>" +
+        hint +
+        "&darr;\n" +
+        row.message +
+        ": " +
+        decodeURIComponent(escape(row.blob1)) +
+        "\n" +
+        hint +
+        "&uarr;</pre>"
+      );
+
     default:
       return "Unknown message type<pre>" + JSON.stringify(row) + "</pre>";
   }