2 files changed, 3 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index 9cff012d4..5ba113dc3 100644
--- a/Makefile
+++ b/Makefile
@@ -66,11 +66,11 @@ doclinter:
 
 .PHONY: test
 test:
-	@$(PYTHON) -m pytest -v $(TEST)
+	@$(PYTHON) -X dev -m pytest -v $(TEST)
 
 .PHONY: covertest
 covertest:
-	@$(PYTHON) -m pytest -v --cov=sphinx --junitxml=.junit.xml $(TEST)
+	@$(PYTHON) -X dev -m pytest -v --cov=sphinx --junitxml=.junit.xml $(TEST)
 
 .PHONY: build
 build:
diff --git a/tox.ini b/tox.ini
index 5bb5b4639..dbb705a3a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ setenv =
     PYTHONWARNINGS = all,ignore::ImportWarning:importlib._bootstrap_external,ignore::DeprecationWarning:site,ignore::DeprecationWarning:distutils
     PYTEST_ADDOPTS = {env:PYTEST_ADDOPTS:} --color yes
 commands=
-    pytest --durations 25 {posargs}
+    python -X dev -m pytest --durations 25 {posargs}
 
 [testenv:flake8]
 basepython = python3