diff --git a/lib/command/workers/runTests.js b/lib/command/workers/runTests.js
index 13efa1b41..fd86b0c24 100644
--- a/lib/command/workers/runTests.js
+++ b/lib/command/workers/runTests.js
@@ -161,7 +161,7 @@ function initializeListeners() {
         actor: step.actor,
         name: step.name,
         status: step.status,
-        args: _args,
+        args: JSON.stringify(_args),
         startedAt: step.startedAt,
         startTime: step.startTime,
         endTime: step.endTime,