diff --git a/tests/marimos/test_validation.py b/tests/marimos/test_validation.py
index 6d71c1f..7f7ba13 100644
--- a/tests/marimos/test_validation.py
+++ b/tests/marimos/test_validation.py
@@ -18,7 +18,7 @@
     subprocess.check_call,
     env={
         "PYTHONPATH": "{}:{}".format(
-            Path(__file__).parent.parent,
+            Path(__file__).parent.parent.parent,
             os.environ.get("PYTHONPATH"),
         )
     },