1 files changed, 1 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index cbb745ac..7fd47dfe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,6 +30,7 @@ passenv = *
 setenv =
     pypy,pypy{2,3}: COVERAGE_NO_CTRACER=no C extension under PyPy
     jython: COVERAGE_NO_CTRACER=no C extension under Jython
+    jython: PYTEST_ADDOPTS=-n 0
 
 commands =
     python setup.py --quiet clean develop