diff --git a/helpers/make-strip-nondeterminism b/helpers/make-strip-nondeterminism
index 74640ffeba53b85a1fe9ce6600978731903f57f6..efcf636f2950b305dd7c576dfa1a9f52ac9b82d1 100644
--- a/helpers/make-strip-nondeterminism
+++ b/helpers/make-strip-nondeterminism
@@ -25,6 +25,9 @@ DEPENDS=libarchive-cpio-perl
 
 . ./config
 
+sed '/debhelper/s/10/9/' -i debian/control
+echo 9 > debian/compat
+
 changelog "Backported from bionic"
 
 compile