diff --git a/sharedmodel/subscription.go b/sharedmodel/subscription.go
index e5485cc..a000990 100644
--- a/sharedmodel/subscription.go
+++ b/sharedmodel/subscription.go
@@ -27,7 +27,7 @@ type Subscription struct {
 	SubjectAddressCity         string
 	SubjectAddressCountry      string
 	ProtocolMeta               string
-	ServiceConfigID            uint
+	ServiceConfigID            uint `gorm:"primarykey"`
 	ServiceConfig              *ServiceConfig
 }