diff --git a/context/input.go b/context/input.go
index 6c662820..3ed0bbe5 100644
--- a/context/input.go
+++ b/context/input.go
@@ -198,7 +198,7 @@ func (input *BeegoInput) Refer() string {
 // if aa.bb.domain.com, returns aa.bb .
 func (input *BeegoInput) SubDomains() string {
 	parts := strings.Split(input.Host(), ".")
-	return strings.Join(parts[len(parts)-2:], ".")
+	return strings.Join(parts[:len(parts)-2], ".")
 }
 
 // Port returns request client port.