diff --git a/public/app/plugins/datasource/tempo/resultTransformer.ts b/public/app/plugins/datasource/tempo/resultTransformer.ts
index 8b32d6b24aa..d1ea575d037 100644
--- a/public/app/plugins/datasource/tempo/resultTransformer.ts
+++ b/public/app/plugins/datasource/tempo/resultTransformer.ts
@@ -696,6 +696,7 @@ const traceSubFrame = (
     fields: [
       {
         name: 'traceIdHidden',
+        type: FieldType.string,
         config: {
           custom: { hidden: true },
         },