diff --git a/modules/backend/models/BrandSetting.php b/modules/backend/models/BrandSetting.php
index 389f12d12..c03160af9 100644
--- a/modules/backend/models/BrandSetting.php
+++ b/modules/backend/models/BrandSetting.php
@@ -41,8 +41,11 @@ class BrandSetting extends Model
     public $attachOne = [
         'logo' => \System\Models\File::class
     ];
-
-    const CACHE_KEY = 'backend::brand.custom_css';
+    
+    /**
+     * @var string The key to store rendered CSS in the cache under
+     */
+    public $cacheKey = 'backend::brand.custom_css';
 
     const PRIMARY_COLOR   = '#34495e'; // Wet Asphalt
     const SECONDARY_COLOR = '#e67e22'; // Pumpkin
@@ -79,7 +82,7 @@ class BrandSetting extends Model
 
     public function afterSave()
     {
-        Cache::forget(self::CACHE_KEY);
+        Cache::forget(self::instance()->cacheKey);
     }
 
     public static function getLogo()
@@ -95,13 +98,14 @@ class BrandSetting extends Model
 
     public static function renderCss()
     {
-        if (Cache::has(self::CACHE_KEY)) {
-            return Cache::get(self::CACHE_KEY);
+        $cacheKey = self::instance()->cacheKey;
+        if (Cache::has($cacheKey)) {
+            return Cache::get($cacheKey);
         }
 
         try {
             $customCss = self::compileCss();
-            Cache::forever(self::CACHE_KEY, $customCss);
+            Cache::forever($cacheKey, $customCss);
         }
         catch (Exception $ex) {
             $customCss = '/* ' . $ex->getMessage() . ' */';
diff --git a/modules/backend/models/EditorSetting.php b/modules/backend/models/EditorSetting.php
index 9dc9d86ec..4fda96bcf 100644
--- a/modules/backend/models/EditorSetting.php
+++ b/modules/backend/models/EditorSetting.php
@@ -33,8 +33,11 @@ class EditorSetting extends Model
      * @var mixed Settings form field defitions
      */
     public $settingsFields = 'fields.yaml';
-
-    const CACHE_KEY = 'backend::editor.custom_css';
+    
+    /**
+     * @var string The key to store rendered CSS in the cache under
+     */
+    public $cacheKey = 'backend::editor.custom_css';
 
     protected $defaultHtmlAllowEmptyTags = 'textarea, a, iframe, object, video, style, script';
 
@@ -100,7 +103,7 @@ class EditorSetting extends Model
 
     public function afterSave()
     {
-        Cache::forget(self::CACHE_KEY);
+        Cache::forget(self::instance()->cacheKey);
     }
 
     protected function makeStylesForTable($arr)
@@ -157,13 +160,14 @@ class EditorSetting extends Model
 
     public static function renderCss()
     {
-        if (Cache::has(self::CACHE_KEY)) {
-            return Cache::get(self::CACHE_KEY);
+        $cacheKey = self::instance()->cacheKey;
+        if (Cache::has($cacheKey)) {
+            return Cache::get($cacheKey);
         }
 
         try {
             $customCss = self::compileCss();
-            Cache::forever(self::CACHE_KEY, $customCss);
+            Cache::forever($cacheKey, $customCss);
         }
         catch (Exception $ex) {
             $customCss = '/* ' . $ex->getMessage() . ' */';
diff --git a/modules/system/models/MailBrandSetting.php b/modules/system/models/MailBrandSetting.php
index 9f2a075c5..528ce2641 100644
--- a/modules/system/models/MailBrandSetting.php
+++ b/modules/system/models/MailBrandSetting.php
@@ -35,8 +35,11 @@ class MailBrandSetting extends Model
      * @var mixed Settings form field defitions
      */
     public $settingsFields = 'fields.yaml';
-
-    const CACHE_KEY = 'system::mailbrand.custom_css';
+    
+    /**
+     * @var string The key to store rendered CSS in the cache under
+     */
+    public $cacheKey = 'system::mailbrand.custom_css';
 
     const WHITE_COLOR = '#fff';
     const BODY_BG = '#f5f8fa';
@@ -80,18 +83,19 @@ class MailBrandSetting extends Model
 
     public function resetCache()
     {
-        Cache::forget(self::CACHE_KEY);
+        Cache::forget(self::instance()->cacheKey);
     }
 
     public static function renderCss()
     {
-        if (Cache::has(self::CACHE_KEY)) {
-            return Cache::get(self::CACHE_KEY);
+        $cacheKey = self::instance()->cacheKey;
+        if (Cache::has($cacheKey)) {
+            return Cache::get($cacheKey);
         }
 
         try {
             $customCss = self::compileCss();
-            Cache::forever(self::CACHE_KEY, $customCss);
+            Cache::forever($cacheKey, $customCss);
         }
         catch (Exception $ex) {
             $customCss = '/* ' . $ex->getMessage() . ' */';