diff --git a/Makefile b/Makefile
index 5e48a15fb4c89572a3feb25d8bdffe3f820ecdf7..5764d68dc6a2fd9d241ad6e481334b507fa168b5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
-make: pref13 pref35 ppparis
-pref13:
-	python pref13.py
+make: pref06 pref13 pref35 ppparis
 pref06:
 	python pref06.py
+pref13:
+	python pref13.py
 pref35:
 	python pref35.py
 ppparis: