diff --git a/setup.cfg b/setup.cfg
index e053fef..945e0fa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,3 +5,7 @@ formats=bztar
 source-dir = rst
 build-dir  = doc
 
+[tool:pytest]
+markers =
+    no_ssl
+
diff --git a/test/test_dugong.py b/test/test_dugong.py
index ef1409e..6f731e8 100755
--- a/test/test_dugong.py
+++ b/test/test_dugong.py
@@ -83,10 +83,17 @@ def pytest_generate_tests(metafunc):
     if not 'http_server' in metafunc.fixturenames:
         return
 
-    if getattr(metafunc.function, 'no_ssl', False):
-        params = ('plain',)
+    if hasattr(metafunc, 'definition'):
+        if metafunc.definition.get_closest_marker('no_ssl'):
+            params = ('plain',)
+        else:
+            params = ('plain', 'ssl')
     else:
-        params = ('plain', 'ssl')
+        # pytest < 3.6
+        if getattr(metafunc.function, 'no_ssl', False):
+            params = ('plain',)
+        else:
+            params = ('plain', 'ssl')
 
     metafunc.parametrize("http_server", params,
                          indirect=True, scope='module')