1 files changed, 1 insertions, 1 deletions
diff --git a/Digitigrade/Model/Instance.php b/Digitigrade/Model/Instance.php
index 9e54a5f..2fc2f17 100644
--- a/Digitigrade/Model/Instance.php
+++ b/Digitigrade/Model/Instance.php
@@ -175,7 +175,7 @@ class Instance extends FetchableModel {
         return false;
     }
 
-    public function pushObject(\JsonSerializable $obj) {
+    public function pushObject(PushableModel $obj) {
         if (!isset($this->endpoints->push)) {
             throw new \RuntimeException("can't push to $this->domain because it doesn't have a push endpoint");
         }