diff --git a/tests/test_serving.py b/tests/test_serving.py
index a2c03ee26..f44c3259f 100644
--- a/tests/test_serving.py
+++ b/tests/test_serving.py
@@ -62,6 +62,18 @@ def app(environ, start_response):
     assert res.read() == b'YES'
 
 
+def test_double_slash_path(dev_server):
+    server = dev_server('''
+    def app(environ, start_response):
+        assert 'fail' not in environ['HTTP_HOST']
+        start_response('200 OK', [('Content-Type', 'text/plain')])
+        return [b'YES']
+    ''')
+
+    r = requests.get(server.url + '//fail')
+    assert r.content == b'YES'
+
+
 def test_broken_app(dev_server):
     server = dev_server('''
     def app(environ, start_response):