diff --git a/pkg/driver/identityserver.go b/pkg/driver/identityserver.go
index 8598bd3..124c48f 100644
--- a/pkg/driver/identityserver.go
+++ b/pkg/driver/identityserver.go
@@ -7,6 +7,7 @@ import (
 )
 
 type IdentityServer struct {
+	csi.UnimplementedIdentityServer
 	Driver *SeaweedFsDriver
 }