diff --git a/platform/framework/src/register/CustomRegistrars.js b/platform/framework/src/register/CustomRegistrars.js
index 392a8c98c7..c9d40dd0ab 100644
--- a/platform/framework/src/register/CustomRegistrars.js
+++ b/platform/framework/src/register/CustomRegistrars.js
@@ -46,7 +46,6 @@ define(
                     var key = extension.key,
                         dependencies = extension.depends || [];
 
-
                     if (!key) {
                         $log.warn([
                             "Cannot register ",
diff --git a/platform/framework/src/resolve/ExtensionResolver.js b/platform/framework/src/resolve/ExtensionResolver.js
index 86eb657f35..126b9ab3f9 100644
--- a/platform/framework/src/resolve/ExtensionResolver.js
+++ b/platform/framework/src/resolve/ExtensionResolver.js
@@ -44,13 +44,20 @@ define(
                     implPromise = loader.load(implPath),
                     definition = extension.getDefinition();
 
+                // Wrap a constructor function (to avoid modifying the original)
+                function constructorFor(impl) {
+                    function Constructor() {
+                        return impl.apply(this, arguments);
+                    }
+                    Constructor.prototype = impl.prototype;
+                    return Constructor;
+                }
+
                 // Attach values from the object definition to the
                 // loaded implementation.
                 function attachDefinition(impl) {
                     var result = (typeof impl === 'function') ?
-                            function () {
-                                return impl.apply({}, arguments);
-                            } :
+                            constructorFor(impl) :
                             Object.create(impl);
 
                     // Copy over static properties