diff --git a/src/common/core/misc/plugin.json b/src/common/core/misc/plugin.json
index b9b2d6235..df51eb07a 100644
--- a/src/common/core/misc/plugin.json
+++ b/src/common/core/misc/plugin.json
@@ -110,7 +110,7 @@
       "help": "HTTP3 alternate service port. This value will be used as part of the Alt-Svc header.",
       "id": "http3-alt-svc-port",
       "label": "HTTP3 Alt-Svc port",
-      "regex": "^\\d+$",
+      "regex": "^((6553[0-5])|(655[0-2][0-9])|(65[0-4][0-9]{2})|(6[0-4][0-9]{3})|([1-5][0-9]{4})|([0-5]{0,5})|([0-9]{1,4}))$",
       "type": "text"
     },
     "LISTEN_HTTP": {