diff --git a/doc/Makefile.am b/doc/Makefile.am
index c28c140..f78afff 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -2,3 +2,4 @@ EXTRA_DIST = conf.py apiref.rst index.rst ext/refcounting.py
 
 clean-local:
 	rm -rf .build
+	rm -f ext/refcounting.pyc