diff --git a/ndncert/debian/rules b/ndncert/debian/rules
index 1f22ee3..983e7d5 100755
--- a/ndncert/debian/rules
+++ b/ndncert/debian/rules
@@ -35,6 +35,7 @@
 	rm -rf .waf-1*
 	rm -rf .waf3-1*
 	rm -f .waf-tools/*.pyc
+	rm -rf .waf-tools/__pycache__
 
 override_dh_auto_test: