diff --git a/.hgignore b/.hgignore
index 5f7505f..65d5044 100644
--- a/.hgignore
+++ b/.hgignore
@@ -3,6 +3,7 @@
 ^include/
 ^lib/
 ^man/
+^\.tox/
 /__pycache__/
 \.egg$
 \.egg-info/