diff --git a/src/ResourceServer.php b/src/ResourceServer.php
index c58df1f7..0e8c87d3 100644
--- a/src/ResourceServer.php
+++ b/src/ResourceServer.php
@@ -16,6 +16,7 @@ use League\OAuth2\Server\Storage\AccessTokenInterface;
 use League\OAuth2\Server\Storage\SessionInterface;
 use League\OAuth2\Server\Storage\ScopeInterface;
 use League\OAuth2\Server\Entity\AccessTokenEntity;
+use League\OAuth2\Server\TokenType\Bearer;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -194,9 +195,8 @@ class ResourceServer extends AbstractServer
      */
     public function determineAccessToken($headersOnly = false)
     {
-        if ($header = $this->getRequest()->headers->get('Authorization')) {
-            $accessToken = trim(preg_replace('/^(?:\s+)?Bearer\s/', '', $header));
-            $accessToken = ($accessToken === 'Bearer') ? '' : $accessToken;
+        if ($this->getRequest()->headers->get('Authorization') !== null) {
+            $accessToken = $this->getTokenType()->determineAccessTokenInHeader($this->getRequest());
         } elseif ($headersOnly === false) {
             $accessToken = ($this->getRequest()->server->get('REQUEST_METHOD') === 'GET') ?
                                 $this->getRequest()->query->get($this->tokenKey) :
diff --git a/src/TokenType/AbstractTokenType.php b/src/TokenType/AbstractTokenType.php
index ea0b2549..addba71f 100644
--- a/src/TokenType/AbstractTokenType.php
+++ b/src/TokenType/AbstractTokenType.php
@@ -11,6 +11,8 @@
 
 namespace League\OAuth2\Server\TokenType;
 
+use Symfony\Component\HttpFoundation\Request;
+
 abstract class AbstractTokenType
 {
     /**
@@ -38,4 +40,11 @@ abstract class AbstractTokenType
     {
         return isset($this->response[$key]) ? $this->response[$key] : null;
     }
+
+    /**
+     * Determine the access token in the authorization header
+     * @param \Symfony\Component\HttpFoundation\Request $request
+     * @return string
+     */
+    abstract public function determineAccessTokenInHeader(Request $request);
 }
diff --git a/src/TokenType/Bearer.php b/src/TokenType/Bearer.php
index ab8350a6..dcacf2fc 100644
--- a/src/TokenType/Bearer.php
+++ b/src/TokenType/Bearer.php
@@ -11,6 +11,8 @@
 
 namespace League\OAuth2\Server\TokenType;
 
+use Symfony\Component\HttpFoundation\Request;
+
 class Bearer extends AbstractTokenType implements TokenTypeInterface
 {
     /**
@@ -31,4 +33,14 @@ class Bearer extends AbstractTokenType implements TokenTypeInterface
 
         return $return;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function determineAccessTokenInHeader(Request $request)
+    {
+        $header = $request->headers->get('Authorization');
+        $accessToken = trim(preg_replace('/^(?:\s+)?Bearer\s/', '', $header));
+        return ($accessToken === 'Bearer') ? '' : $accessToken;
+    }
 }