diff --git a/hooks/conf_regen/10-apt b/hooks/conf_regen/10-apt
index a28a869ab..93ff053b8 100755
--- a/hooks/conf_regen/10-apt
+++ b/hooks/conf_regen/10-apt
@@ -2,6 +2,8 @@
 
 set -e
 
+readonly YNH_DEFAULT_PHP_VERSION=7.4
+
 do_pre_regen() {
     pending_dir=$1