diff --git a/tox.ini b/tox.ini
index 8dbc1582..447ff323 100644
--- a/tox.ini
+++ b/tox.ini
@@ -65,7 +65,7 @@ passenv =
 
 [testenv:test]
 # TODO: Remove as part of MOTOR-1163
-; setenv = AIOHTTP_NO_EXTENSIONS=1
+setenv = AIOHTTP_NO_EXTENSIONS=1
 commands =
     python --version
     python -m pytest -v {posargs}