diff --git a/zeroconf/src/macos/service_ref.rs b/zeroconf/src/macos/service_ref.rs
index 18ebbf6..4d3540f 100644
--- a/zeroconf/src/macos/service_ref.rs
+++ b/zeroconf/src/macos/service_ref.rs
@@ -56,7 +56,7 @@ impl ManagedDNSServiceRef {
                 regtype,
                 domain,
                 host,
-                port,
+                port.to_be(),
                 txt_len,
                 txt_record,
                 callback,