1 files changed, 2 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index ddfeddf9..2d43e76f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,8 @@ envlist=python
 minversion = 3.2
 requires =
 	tox-pip-version >= 0.0.6
+	# workaround for #1998
+	virtualenv < 20
 
 [helpers]
 # Custom pip behavior