diff --git a/tutorial/py.twisted/Makefile.am b/tutorial/py.twisted/Makefile.am
index 1973000..3a553eb 100755
--- a/tutorial/py.twisted/Makefile.am
+++ b/tutorial/py.twisted/Makefile.am
@@ -30,6 +30,9 @@
 tutorialclient: all
 	${PYTHON} PythonClient.py
 
+clean-local:
+	$(RM) -r gen-*
+
 EXTRA_DIST = \
 	PythonServer.py \
 	PythonClient.py