diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 7f86c7309c30291423c62e9e661a5fab57bcf389..143ff8754be2675ddaac809cc973ea3bc605468a 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -4,6 +4,8 @@
 Feeds 6.x 1.0 xxxxx xx, 2010-xx-xx
 ----------------------------------
 
+- #735444 Doug Preble: PubSubHubbub - Fix "Subscription refused by callback URL"
+  with PHP 5.2.0.
 - alex_b: Suppress namespace warnings when parsing feeds for subscription in
   PuSHSubscriber.inc
 - #724184 ekes: catch failures when parsing for PubSubHubbub hub and self.
diff --git a/libraries/PuSHSubscriber.inc b/libraries/PuSHSubscriber.inc
index c1cc43821a7c8f3d3d1a75fc79e7bd2fab608445..3e3b1d3262d7b25324d6e97a4eb5fcb7faadee74 100644
--- a/libraries/PuSHSubscriber.inc
+++ b/libraries/PuSHSubscriber.inc
@@ -276,7 +276,7 @@ class PuSHSubscriber {
    * Helper for loading a subscription.
    */
   protected function loadSubscription() {
-    return call_user_func("{$this->subscription_class}::load", $this->domain, $this->subscriber_id);
+    return call_user_func(array($this->subscription_class, 'load'), $this->domain, $this->subscriber_id);
   }
 
   /**