diff --git a/city.go b/city.go
index 7a2a3ed..9ae3d48 100644
--- a/city.go
+++ b/city.go
@@ -37,6 +37,10 @@ func (db *City) load(fn string) error {
 	if err != nil {
 		return err
 	}
+	defer func() {
+		db.file.Close()
+		db.file = nil
+	}()
 	b4 := make([]byte, 4)
 	_, err = db.file.Read(b4)
 	if err != nil {
diff --git a/district.go b/district.go
index b7b64e3..f818818 100644
--- a/district.go
+++ b/district.go
@@ -35,6 +35,10 @@ func (db *District) load(fn string) error {
 	if err != nil {
 		return err
 	}
+	defer func() {
+		db.file.Close()
+		db.file = nil
+	}()
 
 	b4 := make([]byte, 4)
 	_, err = db.file.Read(b4)