diff --git a/src/GitList/Git/Repository.php b/src/GitList/Git/Repository.php
index ab5840b..8bd51dc 100644
--- a/src/GitList/Git/Repository.php
+++ b/src/GitList/Git/Repository.php
@@ -27,7 +27,7 @@ class Repository extends BaseRepository
     /**
      * Get the current branch, returning a default value when HEAD is detached.
      */
-    public function getHead()
+    public function getHead($default = null)
     {
         $client = $this->getClient();