diff --git a/pytest.ini b/pytest.ini
index ba41d40..3f0f684 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -9,7 +9,7 @@ filterwarnings =
     ignore::PendingDeprecationWarning
 
 # Do not run tests in the build folder
-norecursedirs= build, .ipynb_checkpoints
+norecursedirs= build .ipynb_checkpoints
 
 # PEP-8 The following are ignored:
 # E501 line too long (82 > 79 characters)