diff --git a/Entity/RefreshToken.php b/Entity/RefreshToken.php
index b07f16bb..976c0973 100644
--- a/Entity/RefreshToken.php
+++ b/Entity/RefreshToken.php
@@ -153,4 +153,12 @@ public function isValid()
 
         return ($this->valid >= $datetime) ? true : false;
     }
+
+    /**
+     * @return string Refresh Token
+     */
+    public function __toString()
+    {
+        return $this->getRefreshToken();
+    }
 }