diff --git a/hosts.go b/hosts.go
index 1a1d83c..8357754 100644
--- a/hosts.go
+++ b/hosts.go
@@ -109,6 +109,7 @@ func (f *FileHosts) Refresh() {
 	if err != nil {
 		panic("Can't open " + f.file)
 	}
+	defer buf.Close()
 
 	scanner := bufio.NewScanner(buf)
 	for scanner.Scan() {