diff --git a/code/SecureFileController.php b/code/SecureFileController.php
index 1729397..339e35f 100644
--- a/code/SecureFileController.php
+++ b/code/SecureFileController.php
@@ -66,7 +66,7 @@ public function handleRequest(SS_HTTPRequest $request, DataModel $model) {
 					Security::permissionFailure($self, 'You are not authorised to access this resource. Please log in.');
 				} else {
 					// File doesn't exist
-					return $this->httpError(404);
+					return $self->httpError(404);
 				}
 			}