diff --git a/src/Entities/Interfaces/RefreshTokenEntityInterface.php b/src/Entities/Interfaces/RefreshTokenEntityInterface.php
index f6c91b97..a095d4a1 100644
--- a/src/Entities/Interfaces/RefreshTokenEntityInterface.php
+++ b/src/Entities/Interfaces/RefreshTokenEntityInterface.php
@@ -1,17 +1,42 @@
 <?php
 namespace League\OAuth2\Server\Entities\Interfaces;
 
-interface RefreshTokenEntityInterface extends TokenInterface
+interface RefreshTokenEntityInterface
 {
     /**
-     * Set the original access token that the refresh token was associated with
+     * Get the token's identifier
+     * @return string
+     */
+    public function getIdentifier();
+
+    /**
+     * Set the token's identifier
+     * @param $identifier
+     */
+    public function setIdentifier($identifier);
+
+    /**
+     * Get the token's expiry date time
+     * @return \DateTime
+     */
+    public function getExpiryDateTime();
+
+    /**
+     * Set the date time when the token expires
+     * @param \DateTime $dateTime
+     */
+    public function setExpiryDateTime(\DateTime $dateTime);
+
+    /**
+     * Set the access token that the refresh token was associated with
+     *
      * @param \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface $accessToken
      */
-    public function setOriginalAccessToken(AccessTokenEntityInterface $accessToken);
+    public function setAccessToken(AccessTokenEntityInterface $accessToken);
 
     /**
      * Get the access token that the refresh token was originally associated with
      * @return \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface
      */
-    public function getOriginalAccessToken();
+    public function getAccessToken();
 }
diff --git a/src/Entities/RefreshTokenEntity.php b/src/Entities/RefreshTokenEntity.php
index 8c5ee6fd..1f6c6d07 100644
--- a/src/Entities/RefreshTokenEntity.php
+++ b/src/Entities/RefreshTokenEntity.php
@@ -12,5 +12,5 @@ use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
  */
 class RefreshTokenEntity implements RefreshTokenEntityInterface
 {
-    use EntityTrait, TokenEntityTrait, RefreshTokenTrait;
+    use EntityTrait, RefreshTokenTrait;
 }
diff --git a/src/Entities/Traits/RefreshTokenTrait.php b/src/Entities/Traits/RefreshTokenTrait.php
index 06f81808..71e39225 100644
--- a/src/Entities/Traits/RefreshTokenTrait.php
+++ b/src/Entities/Traits/RefreshTokenTrait.php
@@ -1,6 +1,7 @@
 <?php
 namespace League\OAuth2\Server\Entities\Traits;
 
+use DateTime;
 use League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface;
 
 trait RefreshTokenTrait
@@ -8,23 +9,45 @@ trait RefreshTokenTrait
     /**
      * @var AccessTokenEntityInterface
      */
-    protected $originalAccessToken;
+    protected $accessToken;
 
     /**
-     * Set the original access token that the refresh token was associated with
-     * @param \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface $accessToken
+     * @var DateTime
      */
-    public function setOriginalAccessToken(AccessTokenEntityInterface $accessToken)
+    protected $expiryDateTime;
+
+    /**
+     * @inheritdoc
+     */
+    public function setAccessToken(AccessTokenEntityInterface $accessToken)
     {
-        $this->originalAccessToken = $accessToken;
+        $this->accessToken = $accessToken;
     }
 
     /**
-     * Get the access token that the refresh token was originally associated with
-     * @return \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface
+     * @inheritdoc
      */
-    public function getOriginalAccessToken()
+    public function getAccessToken()
     {
-        return $this->originalAccessToken;
+        return $this->accessToken;
+    }
+
+    /**
+     * Get the token's expiry date time
+     * @return DateTime
+     */
+    public function getExpiryDateTime()
+    {
+        return $this->expiryDateTime;
+    }
+
+    /**
+     * Set the date time when the token expires
+     *
+     * @param DateTime $dateTime
+     */
+    public function setExpiryDateTime(DateTime $dateTime)
+    {
+        $this->expiryDateTime = $dateTime;
     }
 }
\ No newline at end of file