diff --git a/.gitignore b/.gitignore
index 35b00cc..1c29d6e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,6 @@ build/*
 dist/*
 *.pyc
 *.pyo
+*.so
 msgpack/__version__.py
 msgpack/_msgpack.c