diff --git a/tox.ini b/tox.ini
index 50b4c85b6..a8175f82a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -68,6 +68,8 @@ commands = {posargs}
 [flake8]
 builtins = _
 exclude = .venv,.tox,dist,doc,*egg,.git,build,tools
+# H904: Delay string interpolations at logging calls
+enable-extensions = H904
 ignore = E305,E402,E721,E731,E741,W503,W504
 
 [hacking]