diff --git a/.hgignore b/.hgignore
index 82425ef6..42834cf8 100644
--- a/.hgignore
+++ b/.hgignore
@@ -4,6 +4,7 @@ syntax: regexp
 \.gitignore~
 \ghostdriver\.log
 \.git/
+\.git_/
 \.tox/
 \.cache/
 \.coverage$