diff --git a/modules/cms/classes/Theme.php b/modules/cms/classes/Theme.php
index da5c5d9f4..31470a606 100644
--- a/modules/cms/classes/Theme.php
+++ b/modules/cms/classes/Theme.php
@@ -323,21 +323,13 @@ class Theme
          *
          * Example usage:
          *
-         *     Event::listen('cms.theme.extendConfig', function ($themeCode, $config) {
+         *     Event::listen('cms.theme.extendConfig', function ($themeCode, &$config) {
          *          $config['name'] = 'October Theme';
          *          $config['description'] = 'Another great theme from October CMS';
-         *          return $config;
          *     });
          *
          */
-        if ($results = Event::fire('cms.theme.extendConfig', [$this->getDirName(), $config])) {
-            foreach ($results as $result) {
-                if (!is_array($result)) {
-                    continue;
-                }
-                $config = array_merge($config, $result);
-            }
-        }
+        Event::fire('cms.theme.extendConfig', [$this->getDirName(), &$config]);
 
         return $this->configCache = $config;
     }
@@ -361,7 +353,7 @@ class Theme
          *
          * Example usage:
          *
-         *     Event::listen('cms.theme.extendFormConfig', function ($themeCode, $config) {
+         *     Event::listen('cms.theme.extendFormConfig', function ($themeCode, &$config) {
          *          array_set($config, 'tabs.fields.header_color', [
          *              'label'           => 'Header Colour',
          *              'type'            => 'colorpicker',
@@ -369,18 +361,10 @@ class Theme
          *              'assetVar'        => 'header-bg',
          *              'tab'             => 'Global'
          *          ]);
-         *          return $config;
          *     });
          *
          */
-        if ($results = Event::fire('cms.theme.extendFormConfig', [$this->getDirName(), $config])) {
-            foreach ($results as $result) {
-                if (!is_array($result)) {
-                    continue;
-                }
-                $config = array_merge($config, $result);
-            }
-        }
+        Event::fire('cms.theme.extendFormConfig', [$this->getDirName(), &$config]);
 
         return $config;
     }