diff --git a/helpers/helpers.v2.1.d/utils b/helpers/helpers.v2.1.d/utils
index 00c67c792..859cd29d9 100644
--- a/helpers/helpers.v2.1.d/utils
+++ b/helpers/helpers.v2.1.d/utils
@@ -257,7 +257,7 @@ _ynh_apply_default_permissions() {
         if [ "$target" ==  "${install_dir:-}" ]
         then
             # Read the group from the install_dir manifest resource
-            local group="$(ynh_read_manifest '.resources.install_dir.group' | sed 's/null//g' | sed "s/__APP__/$app/g" | cut -f1 -d:)"
+            local group="$(ynh_read_manifest 'resources.install_dir.group' | sed 's/null//g' | sed "s/__APP__/$app/g" | cut -f1 -d:)"
             if [[ -z "$group" ]]
             then
                 # We set the group to www-data for webapps that do serve static assets, which therefore need to be readable by nginx ...