diff --git a/src/MsGraph.php b/src/MsGraph.php
index 1f753b4..9d53ff0 100755
--- a/src/MsGraph.php
+++ b/src/MsGraph.php
@@ -79,7 +79,7 @@ public function getApiVersion(): string
         return self::$baseUrl;
     }
 
-    public static function setUserModel(object $model): static
+    public static function setUserModel(string $model): static
     {
         self::$userModel = $model;