diff --git a/app/vendor/cakephp-plugins.php b/app/vendor/cakephp-plugins.php
index c161ef702..77331766e 100644
--- a/app/vendor/cakephp-plugins.php
+++ b/app/vendor/cakephp-plugins.php
@@ -13,6 +13,7 @@
         'CoreServer' => $baseDir . '/plugins/CoreServer/',
         'DebugKit' => $baseDir . '/vendor/cakephp/debug_kit/',
         'EnvSource' => $baseDir . '/plugins/EnvSource/',
+        'HistoricPetitionViewer' => $baseDir . '/plugins/HistoricPetitionViewer/',
         'Migrations' => $baseDir . '/vendor/cakephp/migrations/',
         'OrcidSource' => $baseDir . '/plugins/OrcidSource/',
         'SshKeyAuthenticator' => $baseDir . '/plugins/SshKeyAuthenticator/',