diff --git a/packages/pyodide-kernel/src/worker.ts b/packages/pyodide-kernel/src/worker.ts
index ff7bc50..517ddde 100644
--- a/packages/pyodide-kernel/src/worker.ts
+++ b/packages/pyodide-kernel/src/worker.ts
@@ -312,7 +312,6 @@ export class PyodideRemoteKernel {
     }
 
     this._sendWorkerMessage({
-      parentHeader: this.formatResult(this._kernel._parent_header)['header'],
       type: 'execute_return',
     });