diff --git a/tox.ini b/tox.ini
index fde744a..819fc71 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,9 +7,9 @@ envlist =
     {3.8,3.9,3.10}-3.2.x
 
 
-# Don't run coverage when testing with pypy:
+# Don't run coverage if it triggers ValueError("site must subclass AdminSite")
 # see https://github.com/nedbat/coveragepy/issues/1382
-[testenv:pypy310-main,pypy310-5.0.x,{pypy38,pypy39,pypy310}-4.2.x]
+[testenv:pypy310-main,pypy310-5.0.x,{pypy38,pypy39,pypy310}-4.2.x,3.8-4.2.x]
 commands =
     pip install --upgrade pip
     pip install -e .[tests]