diff --git a/seafire/protocol/rfc7230/host.cxx b/seafire/protocol/rfc7230/host.cxx
index 9ca48a4..b77f980 100644
--- a/seafire/protocol/rfc7230/host.cxx
+++ b/seafire/protocol/rfc7230/host.cxx
@@ -33,13 +33,13 @@ namespace seafire::protocol::rfc7230
   host_t::
   try_parse(std::vector<std::string> const& strings, std::error_code&)
   {
-    std::string host_part;
-    std::optional<std::string> opt_port_part;
-
     if (auto it = strings.rbegin(); it != strings.rend()) {
       auto first = it->begin();
       auto last = it->end();
 
+      std::string host_part;
+      std::optional<std::string> opt_port_part;
+
       auto try_parse_host = [&](auto init)
       {
         auto c = init;
@@ -73,12 +73,12 @@ namespace seafire::protocol::rfc7230
       first = try_parse_host(first);
       first = try_parse_port(first);
 
-      if (first != last) {
-        return std::nullopt;
+      if (first == last) {
+        return {{host_part, opt_port_part}};
       }
     }
 
-    return {{host_part, opt_port_part}};
+    return std::nullopt;
   }
 
   std::string