diff --git a/scripts/upgrade b/scripts/upgrade
index 60e5722..12ae2d3 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -72,6 +72,12 @@ if [ -z "$final_path" ]; then
 	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 fi
 
+# If database doesn't exist, create it
+if [ -z "$database" ]; then
+	database="pgsql"
+	ynh_app_setting_set --app=$app --key=database --value=$database
+fi
+
 # Cleaning legacy permissions
 if ynh_legacy_permissions_exists; then
 	ynh_legacy_permissions_delete_all