diff --git a/tests/system/utils/test_main.py b/tests/system/utils/test_main.py
index 50c5537..d25b0d0 100644
--- a/tests/system/utils/test_main.py
+++ b/tests/system/utils/test_main.py
@@ -1,11 +1,10 @@
 # -*- coding: utf-8 -*-
 
+import sys
 import logging
 
 import click_log
-
 import pytest
-
 import requests
 
 from vdirsyncer import http, utils
@@ -64,9 +63,12 @@ def test_request_ssl_fingerprints(httpsserver, fingerprint):
 
 def test_open_graphical_browser(monkeypatch):
     import webbrowser
-    # Just assert that this internal attribute still exists and is some sort of
-    # collection.
-    iter(webbrowser._tryorder)
+    # Just assert that this internal attribute still exists and behaves the way
+    # expected
+    if sys.version_info < (3, 7):
+        iter(webbrowser._tryorder)
+    else:
+        assert webbrowser._tryorder is None
 
     monkeypatch.setattr('webbrowser._tryorder', [])
 
diff --git a/vdirsyncer/utils.py b/vdirsyncer/utils.py
index 0ef355e..6527eff 100644
--- a/vdirsyncer/utils.py
+++ b/vdirsyncer/utils.py
@@ -215,6 +215,9 @@ def open_graphical_browser(url, new=0, autoraise=True):
     cli_names = set(['www-browser', 'links', 'links2', 'elinks', 'lynx',
                      'w3m'])
 
+    if webbrowser._tryorder is None:  # Python 3.7
+        webbrowser.register_standard_browsers()
+
     for name in webbrowser._tryorder:
         if name in cli_names:
             continue