diff --git a/tox.ini b/tox.ini
index cf564b8c..bf64c68f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
+isolated_build=true
 envlist = lint,docs,py
 skipsdist = true