diff --git a/unify/ad_sdk.go b/unify/ad_sdk.go
index 7711ed6..d6f0191 100644
--- a/unify/ad_sdk.go
+++ b/unify/ad_sdk.go
@@ -118,6 +118,7 @@ func (s *Sdk) Match(c *Request) (*Result, error) {
 	params.Add("imei", c.Imei)
 	params.Add("channel", c.Channel)
 	params.Add("version", c.Version)
+	params.Add("os_version", c.OsVersion)
 	params.Add("active", strconv.FormatBool(c.Active))
 	if c.Extra != nil {
 		extra, _ := json.Marshal(c.Extra)