diff --git a/scripts/upgrade b/scripts/upgrade
index 8ff1b15..66df617 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -41,6 +41,12 @@ upgrade_type=$(ynh_check_app_version_changed)
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
+# If backend_path doesn't exist, create it
+if [ -z "$backend_path" ]; then
+	backend_path=/opt/$app
+	ynh_app_setting_set --app=$app --key=backend_path --value=$backend_path
+fi
+
 if [ -z "$set_motd" ]; then
 	set_motd=""
 	ynh_app_setting_set --app=$app --key=set_motd --value=$set_motd