diff --git a/buster/preferences.d/entrouvert-debian-backports b/buster/preferences.d/entrouvert-debian-backports
index e69de29..f03bfbd 100644
--- a/buster/preferences.d/entrouvert-debian-backports
+++ b/buster/preferences.d/entrouvert-debian-backports
@@ -0,0 +1,5 @@
+# this file is installed by package entrouvert-archive, do not edit
+
+Package: haproxy
+Pin: release a=buster-backports
+Pin-Priority: 900