diff --git a/inc/class.zcfspublicbehaviors.php b/inc/class.zcfspublicbehaviors.php
index a9f11ec..0a4bf10 100644
--- a/inc/class.zcfspublicbehaviors.php
+++ b/inc/class.zcfspublicbehaviors.php
@@ -28,7 +28,7 @@ class zcfsPublicBehaviors
      */
     public static function coreBlogGetPosts(dcRecord $rs)
     {
-        $GLOBALS['beforeZcFeedRsExt'] = $rs->extensions();
+        dcCore::app()->__set('beforeZcFeedRsExt', $rs->extensions());
         $rs->extend('zcfsRsExtPosts');
     }
 
diff --git a/inc/class.zcfsrsextposts.php b/inc/class.zcfsrsextposts.php
index 877541a..894952a 100644
--- a/inc/class.zcfsrsextposts.php
+++ b/inc/class.zcfsrsextposts.php
@@ -53,8 +53,9 @@ class zcfsRsExtPosts extends rsExtPost
      */
     public static function zcFeedBrother($type, $args)
     {
-        if (!empty($GLOBALS['beforeZcFeedRsExt'][$type])) {
-            $func = $GLOBALS['beforeZcFeedRsExt'][$type];
+        $ext = dcCore::app()->__get('beforeZcFeedRsExt');
+        if (null !== $ext && !empty($ext[$type])) {
+            $func = $ext[$type];
         } elseif (is_callable('rsExtPostPublic', $type)) {
             $func = ['rsExtPostPublic', $type];
         } else {