diff --git a/src/ResponseTypes/BearerTokenResponse.php b/src/ResponseTypes/BearerTokenResponse.php
index 63598265..a65ecaae 100644
--- a/src/ResponseTypes/BearerTokenResponse.php
+++ b/src/ResponseTypes/BearerTokenResponse.php
@@ -39,7 +39,7 @@ class BearerTokenResponse extends AbstractResponseType
                         'access_token_id'  => $this->accessToken->getIdentifier(),
                         'scopes'           => $this->accessToken->getScopes(),
                         'user_id'          => $this->accessToken->getUserIdentifier(),
-                        'expire_time'      => $expireDateTime,
+                        'expire_time'      => $this->refreshToken->getExpiryDateTime()->getTimestamp(),
                     ]
                 )
             );