diff --git a/src/agents/pi-embedded-runner/run/attempt.model-diagnostic-events.ts b/src/agents/pi-embedded-runner/run/attempt.model-diagnostic-events.ts
index 54fba3bc916..a85aa64489d 100644
--- a/src/agents/pi-embedded-runner/run/attempt.model-diagnostic-events.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.model-diagnostic-events.ts
@@ -218,7 +218,7 @@ function withDiagnosticTraceparentHeader(
   }
   headers[TRACEPARENT_HEADER_NAME] = traceparent;
   return {
-    ...(options ?? {}),
+    ...options,
     headers,
   };
 }