diff --git a/python-nbclient.spec b/python-nbclient.spec
index 2271688..19e46e3 100644
--- a/python-nbclient.spec
+++ b/python-nbclient.spec
@@ -81,7 +81,7 @@ NBClient is a tool for parameterizing andexecuting Jupyter Notebooks.
 %check
 export IPYKERNEL_CELL_NAME="<IPY-INPUT>"
 # tests on parallel notebooks randomly fail - https://github.com/jupyter/nbclient/pull/74#issuecomment-635929953
-%pytest -k 'not test_many_parallel_notebooks or test_async_parallel_notebooks'
+%pytest -k 'not (test_many_parallel_notebooks or test_async_parallel_notebooks)'
 %endif
 
 %if ! %{with test}