diff --git a/main.tsp b/main.tsp
index 773931f..666d8d7 100644
--- a/main.tsp
+++ b/main.tsp
@@ -1,5 +1,6 @@
 import "@typespec/http";
 import "@typespec/openapi";
+import "@typespec/openapi3";
 import "@typespec/json-schema";
 import "./variables.tsp";
 
@@ -458,7 +459,11 @@ scalar IPv4 extends string;
 @format("ipv6")
 scalar IPv6 extends string;
 
-alias IP = IPv4 | IPv6;
+@oneOf
+union IP {
+  ipv4: IPv4,
+  ipv6: IPv6,
+}
 
 scalar IPSlashPort extends string;