diff --git a/setup.cfg b/setup.cfg
index 33ab5f7dd..b35515615 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,4 +33,7 @@ python_requires = >= 3.5.2
 
 [options.extras_require]
 progress =
-  tqdm
\ No newline at end of file
+  tqdm
+
+[tool:pytest]
+python_classes =