diff --git a/js/modules/deferred_to_promise.d.ts b/js/modules/deferred_to_promise.d.ts
deleted file mode 100644
index b4e87b012..000000000
--- a/js/modules/deferred_to_promise.d.ts
+++ /dev/null
@@ -1 +0,0 @@
-export function deferredToPromise<T>(deferred: JQuery.Deferred<any, any, any>): Promise<T>;
diff --git a/js/modules/deferred_to_promise.js b/js/modules/deferred_to_promise.js
deleted file mode 100644
index d6409b09f..000000000
--- a/js/modules/deferred_to_promise.js
+++ /dev/null
@@ -1,3 +0,0 @@
-exports.deferredToPromise = deferred =>
-  // eslint-disable-next-line more/no-then
-  new Promise((resolve, reject) => deferred.then(resolve, reject));
diff --git a/preload.js b/preload.js
index bc8263d5e..bdcb99c9c 100644
--- a/preload.js
+++ b/preload.js
@@ -5,8 +5,6 @@ const path = require('path');
 const { webFrame, remote, clipboard, ipcRenderer } = require('electron');
 const semver = require('semver');
 
-const { deferredToPromise } = require('./js/modules/deferred_to_promise');
-
 const { app } = remote;
 
 const config = require('url').parse(window.location.toString(), true).query;
@@ -74,8 +72,6 @@ window.versionInfo = {
   appInstance: window.getAppInstance(),
 };
 
-window.wrapDeferred = deferredToPromise;
-
 const ipc = ipcRenderer;
 const localeMessages = ipc.sendSync('locale-data');