diff --git a/eng/helix/content/default.runner.json b/eng/helix/content/default.runner.json
index dfb6dacb88..ac621e1a5d 100644
--- a/eng/helix/content/default.runner.json
+++ b/eng/helix/content/default.runner.json
@@ -1,5 +1,4 @@
 {
   "longRunningTestSeconds": 60,
-  "diagnosticMessages": true,
-  "maxParallelThreads": -1
+  "diagnosticMessages": true
 }