diff --git a/platform/framework/src/register/ExtensionRegistrar.js b/platform/framework/src/register/ExtensionRegistrar.js
index 3d471dcdfd..ed5e67be10 100644
--- a/platform/framework/src/register/ExtensionRegistrar.js
+++ b/platform/framework/src/register/ExtensionRegistrar.js
@@ -37,7 +37,7 @@ define(
             // Echo arguments; used to represent groups of non-built-in
             // extensions as a single dependency.
             function echo() {
-                return arguments.slice();
+                return Array.prototype.slice.call(arguments);
             }
 
             // Always return a static value; used to represent plain
diff --git a/platform/framework/src/register/PartialConstructor.js b/platform/framework/src/register/PartialConstructor.js
index 422a51938f..466851db50 100644
--- a/platform/framework/src/register/PartialConstructor.js
+++ b/platform/framework/src/register/PartialConstructor.js
@@ -27,10 +27,10 @@ define(
         function PartialConstructor(Constructor) {
 
             return function () { // Bind services
-                var dependencies = arguments.slice();
+                var dependencies = Array.prototype.slice.call(arguments);
 
                 return function () { // Bind everything else
-                    var other = arguments.slice(),
+                    var other = Array.prototype.slice.call(arguments),
                         instance = {};
 
                     Constructor.apply(instance, dependencies.concat(other));