diff --git a/models/publickey.go b/models/publickey.go
index 3f2fcabd..ed47ff20 100644
--- a/models/publickey.go
+++ b/models/publickey.go
@@ -77,8 +77,8 @@ func init() {
 // PublicKey represents a SSH key of user.
 type PublicKey struct {
 	Id          int64
-	OwnerId     int64  `xorm:"index"`
-	Name        string `xorm:"unique not null"`
+	OwnerId     int64  `xorm:"unique(s) index not null"`
+	Name        string `xorm:"unique(s) not null"`
 	Fingerprint string
 	Content     string    `xorm:"TEXT not null"`
 	Created     time.Time `xorm:"created"`