diff --git a/tox.ini b/tox.ini
index 44e240e03..aebd48150 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,6 +53,7 @@ deps =
     {[test-requirements]deps}
     pytest >= 8.4.1  # https://github.com/pytest-dev/pytest/pull/13502
 passenv =
+    PYTHONTRACEMALLOC
     PYTEST_ADDOPTS
     S3_TEST_FILE_URI
     AWS_ACCESS_KEY_ID