--- a/devtools/shared/adb/adb.js
+++ b/devtools/shared/adb/adb.js
@@ -46,17 +46,17 @@ const ADB = {
       return this._adbFilePromise;
     }
     this._adbFilePromise = getFileForBinary();
     return this._adbFilePromise;
   },
 
   // We startup by launching adb in server mode, and setting
   // the tcp socket preference to |true|
-  start() {
+  async start() {
     return new Promise(async (resolve, reject) => {
       const onSuccessfulStart = () => {
         Services.obs.notifyObservers(null, "adb-ready");
         this.ready = true;
         resolve();
       };
 
       const isAdbRunning = await check();