diff --git a/src/browser/provider/plugin-host.js b/src/browser/provider/plugin-host.js
index 6a696d9261d..ce679f774b4 100644
--- a/src/browser/provider/plugin-host.js
+++ b/src/browser/provider/plugin-host.js
@@ -154,7 +154,7 @@ export default class BrowserProviderPluginHost {
         return value;
     }
 
-    closeBrowserChildWindow (/*browserId*/) {
+    async closeBrowserChildWindow (/*browserId*/) {
         return Promise.resolve();
     }
 }