diff --git a/.gitignore b/.gitignore
index 8f13fb5c..c97dcd42 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,22 +1,23 @@
 _trial_temp
 build
 build-pypy
 MANIFEST
 dist
 apidocs
 *,cover
 .testrepository
 *.pyc
 *.pyd
+*.pyo
 *.so
 *~
 *.swp
 *.swh
 *.swn
 *.swo
 docs/tutorial/index.html
 dulwich.egg-info/
 .tox/
 .idea/
 .coverage
 htmlcov/