diff --git a/tox.ini b/tox.ini
index b00e28ad..00f335d8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ commands = make test
 allowlist_externals =
     make
 
-[testenv: py3108]
+[testenv:py3108]
 # Python 3.10.8 is the most recent version that triggers
 # https://github.com/pytest-dev/pytest-asyncio/issues/757.
 #