diff --git a/src/Endpoints/Search.php b/src/Endpoints/Search.php
index a11ae08..ffa65f1 100644
--- a/src/Endpoints/Search.php
+++ b/src/Endpoints/Search.php
@@ -61,7 +61,7 @@ public function query(): EntityCollection
         }
 
         if ($this->startCursor !== null) {
-            $postData['start_cursor'] = $this->startCursor;
+            $postData['start_cursor'] = $this->startCursor->__toString();
         }
 
         if ($this->pageSize !== null) {