diff --git a/vscode.proposed.d.ts b/vscode.proposed.d.ts
index 9ab1a3a38d..4f7fccd77b 100644
--- a/vscode.proposed.d.ts
+++ b/vscode.proposed.d.ts
@@ -497,8 +497,6 @@ declare module 'vscode' {
 		saveNotebookAs(targetResource: Uri, document: NotebookDocument, cancellation: CancellationToken): Promise<void>;
 		readonly onDidChangeNotebook: Event<NotebookDocumentContentChangeEvent | NotebookDocumentEditEvent>;
 		backupNotebook(document: NotebookDocument, context: NotebookDocumentBackupContext, cancellation: CancellationToken): Promise<NotebookDocumentBackup>;
-
-		kernel?: NotebookKernel;
 	}
 
 	export interface NotebookKernel {