diff --git a/src/vs/workbench/browser/workbench.contribution.ts b/src/vs/workbench/browser/workbench.contribution.ts
index 664cc45a74e2b0e0520d07d661ae954fa75e6dd3..741f4e77dc971b4f263dede36ebaba95e96a41cf 100644
--- a/src/vs/workbench/browser/workbench.contribution.ts
+++ b/src/vs/workbench/browser/workbench.contribution.ts
@@ -289,14 +289,14 @@ import { isMacintosh, isWindows, isLinux, isWeb } from 'vs/base/common/platform'
 			},
 			'window.enableMenuBarMnemonics': {
 				'type': 'boolean',
-				'default': true,
+				'default': !isMacintosh,
 				'scope': ConfigurationScope.APPLICATION,
 				'description': nls.localize('enableMenuBarMnemonics', "Controls whether the main menus can be opened via Alt-key shortcuts. Disabling mnemonics allows to bind these Alt-key shortcuts to editor commands instead."),
-				'included': isWindows || isLinux
+				'included': isWindows || isLinux || isWeb
 			},
 			'window.customMenuBarAltFocus': {
 				'type': 'boolean',
-				'default': true,
+				'default': !isMacintosh,
 				'scope': ConfigurationScope.APPLICATION,
 				'markdownDescription': nls.localize('customMenuBarAltFocus', "Controls whether the menu bar will be focused by pressing the Alt-key. This setting has no effect on toggling the menu bar with the Alt-key."),
 				'included': isWindows || isLinux || isWeb