diff --git a/yamldb.go b/yamldb.go
index 02624cc..292afed 100644
--- a/yamldb.go
+++ b/yamldb.go
@@ -47,7 +47,7 @@ func newYamlDB(p string) (yamlDB, error) {
 }
 
 func (db yamlDB) Close() {
-	if os.Getenv("W") == "" {
+	if os.Getenv("RO") != "" {
 		return
 	}
 	b, err := yaml.Marshal(db)