diff --git a/ndns/debian/rules b/ndns/debian/rules
index 618b4ae..208f7be 100755
--- a/ndns/debian/rules
+++ b/ndns/debian/rules
@@ -36,6 +36,7 @@
 	rm -rf .waf3-1*
 	rm -f .waf-tools/*.pyc
 	rm -f docs/*.pyc
+	rm -rf .waf-tools/__pycache__
 
 override_dh_auto_test: