diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index 287257e1..57284e34 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -441,7 +441,7 @@ function curry(fn, length, self, acc) {
         return fn;
 
     // Close over function with 'this'
-    function close(self, fn) () => fn.apply(self, arguments);
+    function close(self, fn) (...args) => fn.apply(self, args);
 
     if (acc == null)
         acc = [];
diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 1526ae0f..eeb77943 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -747,7 +747,7 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
     httpGet: function httpGet(url, callback, self) {
         let params = callback;
         if (!isObject(params))
-            params = { callback: params && (() => callback.apply(self, arguments)) };
+            params = { callback: params && ((...args) => callback.apply(self, args)) };
 
         try {
             let xmlhttp = services.Xmlhttp();