diff --git a/.gitignore b/.gitignore
index 8ff6583a..85b6dd30 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 *~
 build
 dist/
-tornado.egg-info
\ No newline at end of file
+tornado.egg-info
+_auto2to3*