diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index e59077aef22..804ec72e634 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -140,6 +140,7 @@ Sviatoslav Bulbakha
 Taha Jahangir
 Taras Voinarovskyi
 Terence Honles
+Thijs Vermeir
 Thomas Grainger
 Tolga Tezel
 Vaibhav Sagar
diff --git a/aiohttp/web_urldispatcher.py b/aiohttp/web_urldispatcher.py
index 3fbf0742eb4..956d05b70b8 100644
--- a/aiohttp/web_urldispatcher.py
+++ b/aiohttp/web_urldispatcher.py
@@ -500,11 +500,7 @@ def _directory_as_html(self, filepath):
         # sanity check
         assert filepath.is_dir()
 
-        posix_dir_len = len(self._directory.as_posix())
-
-        # remove the beginning of posix path, so it would be relative
-        # to our added static path
-        relative_path_to_dir = filepath.as_posix()[posix_dir_len:]
+        relative_path_to_dir = filepath.relative_to(self._directory).as_posix()
         index_of = "Index of /{}".format(relative_path_to_dir)
         head = "<head>\n<title>{}</title>\n</head>".format(index_of)
         h1 = "<h1>{}</h1>".format(index_of)
@@ -513,7 +509,8 @@ def _directory_as_html(self, filepath):
         dir_index = filepath.iterdir()
         for _file in sorted(dir_index):
             # show file url as relative to static path
-            file_url = _file.as_posix()[posix_dir_len:]
+            file_url = self._prefix + '/' + \
+                _file.relative_to(self._directory).as_posix()
 
             # if file is a directory, add '/' to the end of the name
             if _file.is_dir():
diff --git a/tests/test_web_urldispatcher.py b/tests/test_web_urldispatcher.py
index 3cd7ecd10e0..e852fff69b5 100644
--- a/tests/test_web_urldispatcher.py
+++ b/tests/test_web_urldispatcher.py
@@ -29,17 +29,23 @@ def teardown():
     return tmp_dir
 
 
-@pytest.mark.parametrize("show_index,status,data",
-                         [(False, 403, None),
-                          (True, 200,
-                           b'<html>\n<head>\n<title>Index of /</title>\n'
-                           b'</head>\n<body>\n<h1>Index of /</h1>\n<ul>\n'
+@pytest.mark.parametrize("show_index,status,prefix,data",
+                         [(False, 403, '/', None),
+                          (True, 200, '/',
+                           b'<html>\n<head>\n<title>Index of /.</title>\n'
+                           b'</head>\n<body>\n<h1>Index of /.</h1>\n<ul>\n'
                            b'<li><a href="/my_dir">my_dir/</a></li>\n'
                            b'<li><a href="/my_file">my_file</a></li>\n'
+                           b'</ul>\n</body>\n</html>'),
+                          (True, 200, '/static',
+                           b'<html>\n<head>\n<title>Index of /.</title>\n'
+                           b'</head>\n<body>\n<h1>Index of /.</h1>\n<ul>\n'
+                           b'<li><a href="/static/my_dir">my_dir/</a></li>\n'
+                           b'<li><a href="/static/my_file">my_file</a></li>\n'
                            b'</ul>\n</body>\n</html>')])
 @asyncio.coroutine
 def test_access_root_of_static_handler(tmp_dir_path, loop, test_client,
-                                       show_index, status, data):
+                                       show_index, status, prefix, data):
     """
     Tests the operation of static file server.
     Try to access the root of static file server, and make
@@ -61,11 +67,11 @@ def test_access_root_of_static_handler(tmp_dir_path, loop, test_client,
     app = web.Application(loop=loop)
 
     # Register global static route:
-    app.router.add_static('/', tmp_dir_path, show_index=show_index)
+    app.router.add_static(prefix, tmp_dir_path, show_index=show_index)
     client = yield from test_client(app)
 
     # Request the root of the static directory.
-    r = yield from client.get('/')
+    r = yield from client.get(prefix)
     assert r.status == status
 
     if data:
