diff --git a/.gitignore b/.gitignore
index dac8e3bc0630eb9f4b4ee26e8714e09fcdef0f29..86a4b426ef774550900b5fbb8c1af8fe34e8efb7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 *~
 MANIFEST
 *.pyc
+*.pyo
 *.so
 /kwant/*.c
 /kwant/*/*.c