diff --git a/src/options/default/testRun.ts b/src/options/default/testRun.ts
index a5348d7..686802e 100644
--- a/src/options/default/testRun.ts
+++ b/src/options/default/testRun.ts
@@ -31,6 +31,7 @@ export const testRun: TestCaseCustomizer<TestRunExtractorContext> = {
   ),
   labels: compose2(
     custom.labels<TestRunExtractorContext>({
+      thread: '00',
       suite: '(test file execution)',
     }),
     ({ testRunMetadata }) => testRunMetadata.labels ?? [],