diff --git a/build/patchtester/build.sh b/build/patchtester/build.sh
index 7d686a4..c2e201e 100755
--- a/build/patchtester/build.sh
+++ b/build/patchtester/build.sh
@@ -16,3 +16,4 @@ tar zcf ../packages/com_patchtester.tar.gz .
 zip -r ../packages/com_patchtester.zip .
 cd ../../
 composer install
+php build/patchtester/hash_generator.php
diff --git a/build/patchtester/hash_generator.php b/build/patchtester/hash_generator.php
new file mode 100755
index 0000000..e086994
--- /dev/null
+++ b/build/patchtester/hash_generator.php
@@ -0,0 +1,33 @@
+#!/usr/bin/env php
+<?php
+/**
+ * Script used to generate hashes for release packages
+ *
+ * Usage: php build/patchtester/hash_generator.php
+ *
+ * @copyright  Copyright (C) 2011 - 2012 Ian MacLennan, Copyright (C) 2013 - 2017 Open Source Matters, Inc. All rights reserved.
+ * @license    GNU General Public License version 2 or later
+ */
+
+$packageDir = dirname(__DIR__) . '/packages';
+
+$hashes = array();
+
+/** @var DirectoryIterator $file */
+foreach (new DirectoryIterator($packageDir) as $file)
+{
+	if ($file->isDir() || $file->isDot())
+	{
+		continue;
+	}
+
+	$hashes[$file->getFilename()] = array(
+		'sha384' => hash_file('sha384', $file->getPathname()),
+	);
+}
+
+$jsonOptions = PHP_VERSION_ID >= 50400 ? JSON_PRETTY_PRINT : 0;
+
+@file_put_contents($packageDir . '/checksums.json', json_encode($hashes, $jsonOptions));
+
+echo 'Checksums file generated' . PHP_EOL . PHP_EOL;