diff --git a/src/agents/pi-embedded-runner/model.ts b/src/agents/pi-embedded-runner/model.ts
index 2219bc3d2b9..2bd9e7b3aba 100644
--- a/src/agents/pi-embedded-runner/model.ts
+++ b/src/agents/pi-embedded-runner/model.ts
@@ -308,8 +308,8 @@ function preserveDiscoveredTransportMetadata(params: {
     headers:
       discoveredHeaders || dynamicHeaders
         ? {
-            ...discoveredHeaders,
             ...dynamicHeaders,
+            ...discoveredHeaders,
           }
         : undefined,
   };