diff --git a/code/Forms/UploadField.php b/code/Forms/UploadField.php
index 3417880ee..b5fbc0143 100644
--- a/code/Forms/UploadField.php
+++ b/code/Forms/UploadField.php
@@ -284,7 +284,7 @@ public function setAllowedMaxFileNumber($count)
     public function getAttributes()
     {
         $attributes = array(
-            'class' => $this->extraClass(),
+            'class' => $this->getExtraClass(),
             'type' => 'file',
             'multiple' => $this->getIsMultiUpload(),
             'id' => $this->ID(),