diff --git a/pkg/ttnpb/messages.go b/pkg/ttnpb/messages.go
index 658fe023ec..18e06b66b5 100644
--- a/pkg/ttnpb/messages.go
+++ b/pkg/ttnpb/messages.go
@@ -101,7 +101,7 @@ func (v *ApplicationDownlink) FieldIsZero(p string) bool {
 		return v.FrmPayload == nil
 	case "locations":
 		return v.Locations == nil
-	case "network_ids":
+	case "network_ids": // nolint: goconst
 		return v.NetworkIds == nil
 	case "network_ids.cluster_address":
 		return v.NetworkIds.FieldIsZero("cluster_address")