diff --git a/pyproject.toml b/pyproject.toml
index 7109389d7..5c3117096 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,7 @@ filterwarnings = "ignore::DeprecationWarning"
 python_files = "test_*.py"
 tmp_path_retention_policy = "failed"
 testpaths = "test"  # Space separated list of paths from root e.g test tests doc/testing.
+xfail_strict = true  # Treat the XPASS status as a test failure (unless strict=False is passed).
 # --cov   coverage
 # --cov-report term  # send report to terminal term-missing -> terminal with line numbers  html  xml
 # --cov-report term-missing # to terminal with line numbers