diff --git a/src/League/OAuth2/Server/Grant/GrantTrait.php b/src/League/OAuth2/Server/Grant/GrantTrait.php
index e052ce57..f444fa50 100644
--- a/src/League/OAuth2/Server/Grant/GrantTrait.php
+++ b/src/League/OAuth2/Server/Grant/GrantTrait.php
@@ -22,6 +22,17 @@ trait GrantTrait {
         return $this->identifier;
     }
 
+    /**
+     * Return the identifier
+     * @param string $identifier
+     * @return self
+     */
+    public function setIdentifier($identifier)
+    {
+        $this->identifier = $identifier;
+        return $this;
+    }
+    
     /**
      * Return the response type
      * @return string
@@ -42,4 +53,4 @@ trait GrantTrait {
         return $this;
     }
 
-}
\ No newline at end of file
+}