diff --git a/src/vs/sessions/contrib/configuration/browser/configuration.contribution.ts b/src/vs/sessions/contrib/configuration/browser/configuration.contribution.ts
index 9d11c99feca..e976e17e2eb 100644
--- a/src/vs/sessions/contrib/configuration/browser/configuration.contribution.ts
+++ b/src/vs/sessions/contrib/configuration/browser/configuration.contribution.ts
@@ -56,6 +56,8 @@ Registry.as<IConfigurationRegistry>(Extensions.Configuration).registerDefaultCon
 
 		'search.quickOpen.includeHistory': false,
 
+		'task.notifyWindowOnTaskCompletion': -1,
+
 		'terminal.integrated.initialHint': false,
 
 		'workbench.editor.doubleClickTabToToggleEditorGroupSizes': 'maximize',