--- a/debian/rules	Mon Jun 30 13:38:49 2014 -0400
+++ b/debian/rules	Wed Jul 23 12:08:48 2014 +0200
@@ -18,6 +18,7 @@
 	dh_python2
 
 clean: clean-docs
+	rm -f tests/*.err
 
 clean-docs:
 	rm -rf html