diff --git a/src/vs/base/browser/ui/selectBox/selectBoxCustom.ts b/src/vs/base/browser/ui/selectBox/selectBoxCustom.ts
index fda015360557b687bc9a28f9c8ea3b1aec7f31f2..711cc2dd97f10d326812d317675c6c34c18645bb 100644
--- a/src/vs/base/browser/ui/selectBox/selectBoxCustom.ts
+++ b/src/vs/base/browser/ui/selectBox/selectBoxCustom.ts
@@ -18,6 +18,7 @@ import { IDelegate, IRenderer } from 'vs/base/browser/ui/list/list';
 import { domEvent } from 'vs/base/browser/event';
 import { ScrollbarVisibility } from 'vs/base/common/scrollable';
 import { ISelectBoxDelegate, ISelectBoxStyles, ISelectData } from 'vs/base/browser/ui/selectBox/selectBox';
+import { isMacintosh } from 'vs/base/common/platform';
 
 const $ = dom.$;
 
@@ -173,18 +174,14 @@ export class SelectBoxList implements ISelectBoxDelegate, IDelegate<ISelectOptio
 			let showDropDown = false;
 
 			// Create and drop down select list on keyboard select
-			switch (process.platform) {
-				case 'darwin':
-					if (event.keyCode === KeyCode.DownArrow || event.keyCode === KeyCode.UpArrow || event.keyCode === KeyCode.Space || event.keyCode === KeyCode.Enter) {
-						showDropDown = true;
-					}
-					break;
-				case 'win32':
-				default:
-					if (event.keyCode === KeyCode.DownArrow && event.altKey || event.keyCode === KeyCode.Space || event.keyCode === KeyCode.Enter) {
-						showDropDown = true;
-					}
-					break;
+			if (isMacintosh) {
+				if (event.keyCode === KeyCode.DownArrow || event.keyCode === KeyCode.UpArrow || event.keyCode === KeyCode.Space || event.keyCode === KeyCode.Enter) {
+					showDropDown = true;
+				}
+			} else {
+				if (event.keyCode === KeyCode.DownArrow && event.altKey || event.keyCode === KeyCode.Space || event.keyCode === KeyCode.Enter) {
+					showDropDown = true;
+				}
 			}
 
 			if (showDropDown) {
diff --git a/src/vs/base/browser/ui/selectBox/selectBoxNative.ts b/src/vs/base/browser/ui/selectBox/selectBoxNative.ts
index 2159d869a98bb083fea25dc1c77e36e5851a1bd3..6e74ac6039c8295e7a8946d6fd79d77636314523 100644
--- a/src/vs/base/browser/ui/selectBox/selectBoxNative.ts
+++ b/src/vs/base/browser/ui/selectBox/selectBoxNative.ts
@@ -9,6 +9,7 @@ import { KeyCode } from 'vs/base/common/keyCodes';
 import * as dom from 'vs/base/browser/dom';
 import * as arrays from 'vs/base/common/arrays';
 import { ISelectBoxDelegate, ISelectBoxStyles, ISelectData } from 'vs/base/browser/ui/selectBox/selectBox';
+import { isMacintosh } from 'vs/base/common/platform';
 
 export class SelectBoxNative implements ISelectBoxDelegate {
 
@@ -47,18 +48,14 @@ export class SelectBoxNative implements ISelectBoxDelegate {
 		this.toDispose.push(dom.addStandardDisposableListener(this.selectElement, 'keydown', (e) => {
 			let showSelect = false;
 
-			switch (process.platform) {
-				case 'darwin':
-					if (e.keyCode === KeyCode.DownArrow || e.keyCode === KeyCode.UpArrow || e.keyCode === KeyCode.Space) {
-						showSelect = true;
-					}
-					break;
-				case 'win32':
-				default:
-					if (e.keyCode === KeyCode.DownArrow && e.altKey || e.keyCode === KeyCode.Space || e.keyCode === KeyCode.Enter) {
-						showSelect = true;
-					}
-					break;
+			if (isMacintosh) {
+				if (e.keyCode === KeyCode.DownArrow || e.keyCode === KeyCode.UpArrow || e.keyCode === KeyCode.Space) {
+					showSelect = true;
+				}
+			} else {
+				if (e.keyCode === KeyCode.DownArrow && e.altKey || e.keyCode === KeyCode.Space || e.keyCode === KeyCode.Enter) {
+					showSelect = true;
+				}
 			}
 
 			if (showSelect) {