diff --git a/toolkit/components/osfile/modules/osfile_async_front.jsm b/toolkit/components/osfile/modules/osfile_async_front.jsm
index 81bd99e481c4..69b789cef2b1 100644
--- a/toolkit/components/osfile/modules/osfile_async_front.jsm
+++ b/toolkit/components/osfile/modules/osfile_async_front.jsm
@@ -51,9 +51,11 @@ var Type = SysAll.Type;
 
 var Path = ChromeUtils.import("resource://gre/modules/osfile/ospath.jsm");
 
+const lazy = {};
+
 // The library of promises.
 ChromeUtils.defineModuleGetter(
-  this,
+  lazy,
   "PromiseUtils",
   "resource://gre/modules/PromiseUtils.jsm"
 );
@@ -293,7 +295,7 @@ var Scheduler = {
     // to an obsolete worker (we reactivate it in the `finally`).
     // This needs to be done right now so that we maintain relative
     // ordering with calls to post(), etc.
-    let deferred = PromiseUtils.defer();
+    let deferred = lazy.PromiseUtils.defer();
     let savedQueue = this.queue;
     this.queue = deferred.promise;
 
diff --git a/toolkit/components/osfile/modules/osfile_native.jsm b/toolkit/components/osfile/modules/osfile_native.jsm
index 41725aacd641..652455a458cb 100644
--- a/toolkit/components/osfile/modules/osfile_native.jsm
+++ b/toolkit/components/osfile/modules/osfile_native.jsm
@@ -30,11 +30,13 @@ var { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
 
+const lazy = {};
+
 /**
  * The native service holding the implementation of the functions.
  */
 XPCOMUtils.defineLazyServiceGetter(
-  this,
+  lazy,
   "Internals",
   "@mozilla.org/toolkit/osfile/native-internals;1",
   "nsINativeOSFileInternalsService"
@@ -58,7 +60,7 @@ var read = function(path, options = {}) {
   }
 
   return new Promise((resolve, reject) => {
-    Internals.read(
+    lazy.Internals.read(
       path,
       options,
       function onSuccess(success) {
@@ -105,7 +107,7 @@ var writeAtomic = function(path, buffer, options = {}) {
   }
 
   return new Promise((resolve, reject) => {
-    Internals.writeAtomic(
+    lazy.Internals.writeAtomic(
       path,
       buffer,
       options,