diff --git a/tests/Type/ObjectIdStub.php b/tests/Type/ObjectIdStub.php
index 5379591..b0453ab 100644
--- a/tests/Type/ObjectIdStub.php
+++ b/tests/Type/ObjectIdStub.php
@@ -3,21 +3,21 @@ namespace GraphQL\Tests\Type;
 
 class ObjectIdStub
 {
-	/**
-	 * @var int
-	 */
-	private $id;
+    /**
+     * @var int
+     */
+    private $id;
 
-	/**
-	 * @param int $id
-	 */
-	public function __construct($id)
-	{
-		$this->id = $id;
-	}
+    /**
+     * @param int $id
+     */
+    public function __construct($id)
+    {
+        $this->id = $id;
+    }
 
-	public function __toString()
-	{
-		return (string) $this->id;
-	}
+    public function __toString()
+    {
+        return (string) $this->id;
+    }
 }