diff --git a/tox.ini b/tox.ini
index b209bd9..e147690 100644
--- a/tox.ini
+++ b/tox.ini
@@ -81,3 +81,7 @@ passenv =
     AWS_ACCESS_KEY_ID
     AWS_DEFAULT_REGION
     AWS_SECRET_ACCESS_KEY
+setenv =
+    # workaround for broken C extension in aiohttp
+    # see: https://github.com/aio-libs/aiohttp/issues/7229
+    py312: AIOHTTP_NO_EXTENSIONS=1