diff --git a/testing/web-platform/tests/tools/tox.ini b/testing/web-platform/tests/tools/tox.ini
index 6706c4787fcb..6dd70cd7b2a3 100644
--- a/testing/web-platform/tests/tools/tox.ini
+++ b/testing/web-platform/tests/tools/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py35,py36,py37,py38,pypy,{py27,py35,py36,py37,py38}-flake8,{py35,py36,py37,py38}-mypy
+envlist = py27,py35,py36,py37,py38,{py27,py35,py36,py37,py38}-flake8,{py35,py36,py37,py38}-mypy
 skipsdist=True
 skip_missing_interpreters = False