diff --git a/src/h3/__init__.py b/src/h3/__init__.py
index 5169039..c656d73 100755
--- a/src/h3/__init__.py
+++ b/src/h3/__init__.py
@@ -136,11 +136,12 @@ async def send_http_request(self, url, method='GET', headers=None, content=None,
             self._http._check_content_length = types.MethodType(
                 lambda self, stream: None, self._http)
 
+        path = (url.path or '/') + (f'?{url.query}' if url.query else '')
         self.sent_headers = [
             (b':method', method.encode()),
             (b':scheme', b'https'),
             (b':authority', url.hostname.encode()),
-            (b':path', (url.path or '/').encode()),
+            (b':path', path.encode()),
         ] + [(k.encode(), v.encode()) for k, v in (headers or {}).items()]
 
         stream_id = self._quic.get_next_available_stream_id()
diff --git a/tests/test_send_request.py b/tests/test_send_request.py
index 3e8e6c9..e2cd0c6 100644
--- a/tests/test_send_request.py
+++ b/tests/test_send_request.py
@@ -178,6 +178,28 @@ def _connect(**kwargs):
         self.assertEqual(calls[0]['port'], 443)
 
 
+class TestRequestHeaders(unittest.TestCase):
+    def test_path_includes_query_string(self):
+        async def run():
+            client = h3mod.H3ClientProtocol.__new__(h3mod.H3ClientProtocol)
+            client._http = MagicMock()
+            client._quic = MagicMock()
+            client._quic.get_next_available_stream_id.return_value = 0
+            client._request_waiter = asyncio.get_running_loop().create_future()
+            client._request_waiter.set_result(True)
+            client.http_response_data = bytearray()
+            client.http_response_headers = {}
+            client.transmit = MagicMock()
+
+            await client.send_http_request(
+                urlparse('https://example.com/check?foo=bar&x=1')
+            )
+            headers = dict(client._http.send_headers.call_args.args[1])
+            self.assertEqual(headers[b':path'], b'/check?foo=bar&x=1')
+
+        asyncio.run(run())
+
+
 # ---------------------------------------------------------------------------
 # Tests: show-headers flag
 # ---------------------------------------------------------------------------