diff --git a/dns/asyncquery.py b/dns/asyncquery.py
index e89f836b..efad0fd7 100644
--- a/dns/asyncquery.py
+++ b/dns/asyncquery.py
@@ -704,6 +704,8 @@ async def _http3(
 
     url_parts = urllib.parse.urlparse(url)
     hostname = url_parts.hostname
+    if url_parts.port is not None:
+        port = url_parts.port
 
     q.id = 0
     wire = q.to_wire()
diff --git a/dns/query.py b/dns/query.py
index 43535945..0d8a977a 100644
--- a/dns/query.py
+++ b/dns/query.py
@@ -611,6 +611,8 @@ def _http3(
 
     url_parts = urllib.parse.urlparse(url)
     hostname = url_parts.hostname
+    if url_parts.port is not None:
+        port = url_parts.port
 
     q.id = 0
     wire = q.to_wire()