diff --git a/src/devices/MacDevice.js b/src/devices/MacDevice.tsx
similarity index 85%
rename from src/devices/MacDevice.js
rename to src/devices/MacDevice.tsx
index dc8d4a8b4..5b7fc2adf 100644
--- a/src/devices/MacDevice.js
+++ b/src/devices/MacDevice.tsx
@@ -5,13 +5,12 @@
  * @format
  */
 
-import BaseDevice from './BaseDevice.tsx';
+import BaseDevice from './BaseDevice';
 
 export default class MacDevice extends BaseDevice {
-  os = 'MacOS';
-
   constructor() {
     super('', 'physical', 'Mac');
+    this.os = 'MacOS';
   }
 
   teardown() {}
diff --git a/src/dispatcher/desktopDevice.js b/src/dispatcher/desktopDevice.js
index 301cad085..073afb091 100644
--- a/src/dispatcher/desktopDevice.js
+++ b/src/dispatcher/desktopDevice.js
@@ -8,7 +8,7 @@
 import type {Store} from '../reducers/index.tsx';
 import type {Logger} from '../fb-interfaces/Logger.js';
 
-import MacDevice from '../devices/MacDevice';
+import MacDevice from '../devices/MacDevice.tsx';
 import WindowsDevice from '../devices/WindowsDevice';
 
 export default (store: Store, logger: Logger) => {