diff --git a/src/League/OAuth2/Server/Grant/RefreshToken.php b/src/League/OAuth2/Server/Grant/RefreshToken.php
index 6142f3f2..78e95269 100644
--- a/src/League/OAuth2/Server/Grant/RefreshToken.php
+++ b/src/League/OAuth2/Server/Grant/RefreshToken.php
@@ -186,7 +186,7 @@ class RefreshToken implements GrantTypeInterface {
             }
 
             // Check that there aren't any new scopes being included
-            $existingScopes = [];
+            $existingScopes = array();
             foreach ($scopes as $s) {
                 $existingScopes[] = $s['scope'];
             }