1 files changed, 1 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index f52d7b158..814354047 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@ setenv =
     PYTEST_QT_API=pyqt5
     pyqt{,512,513,514,515,5150}: LINK_PYQT_SKIP=true
     cov: PYTEST_ADDOPTS=--cov --cov-report xml --cov-report=html --cov-report=
+    PYTHONDEVMODE=1
 passenv = PYTHON DISPLAY XAUTHORITY HOME USERNAME USER CI XDG_* QUTE_* DOCKER QT_QUICK_BACKEND PY_COLORS DBUS_SESSION_BUS_ADDRESS
 basepython =
     py: {env:PYTHON:python3}