diff --git a/apps/oauth2/appinfo/info.xml b/apps/oauth2/appinfo/info.xml
index dcef39f80e..f8396d1564 100644
--- a/apps/oauth2/appinfo/info.xml
+++ b/apps/oauth2/appinfo/info.xml
@@ -5,7 +5,7 @@
 	<name>OAuth 2.0</name>
 	<summary>Allows OAuth2 compatible authentication from other web applications.</summary>
 	<description>The OAuth2 app allows administrators to configure the built-in authentication workflow to also allow OAuth2 compatible authentication from other web applications.</description>
-	<version>1.4.0</version>
+	<version>1.4.2</version>
 	<licence>agpl</licence>
 	<author>Lukas Reschke</author>
 	<namespace>OAuth2</namespace>
diff --git a/apps/oauth2/composer/composer/autoload_classmap.php b/apps/oauth2/composer/composer/autoload_classmap.php
index 2773810bd0..d490fef484 100644
--- a/apps/oauth2/composer/composer/autoload_classmap.php
+++ b/apps/oauth2/composer/composer/autoload_classmap.php
@@ -17,5 +17,6 @@ return array(
     'OCA\\OAuth2\\Exceptions\\ClientNotFoundException' => $baseDir . '/../lib/Exceptions/ClientNotFoundException.php',
     'OCA\\OAuth2\\Migration\\SetTokenExpiration' => $baseDir . '/../lib/Migration/SetTokenExpiration.php',
     'OCA\\OAuth2\\Migration\\Version010401Date20181207190718' => $baseDir . '/../lib/Migration/Version010401Date20181207190718.php',
+    'OCA\\OAuth2\\Migration\\Version010402Date20190107124745' => $baseDir . '/../lib/Migration/Version010402Date20190107124745.php',
     'OCA\\OAuth2\\Settings\\Admin' => $baseDir . '/../lib/Settings/Admin.php',
 );
diff --git a/apps/oauth2/composer/composer/autoload_static.php b/apps/oauth2/composer/composer/autoload_static.php
index c4401a0a21..ff30b5d47b 100644
--- a/apps/oauth2/composer/composer/autoload_static.php
+++ b/apps/oauth2/composer/composer/autoload_static.php
@@ -32,6 +32,7 @@ class ComposerStaticInitOAuth2
         'OCA\\OAuth2\\Exceptions\\ClientNotFoundException' => __DIR__ . '/..' . '/../lib/Exceptions/ClientNotFoundException.php',
         'OCA\\OAuth2\\Migration\\SetTokenExpiration' => __DIR__ . '/..' . '/../lib/Migration/SetTokenExpiration.php',
         'OCA\\OAuth2\\Migration\\Version010401Date20181207190718' => __DIR__ . '/..' . '/../lib/Migration/Version010401Date20181207190718.php',
+        'OCA\\OAuth2\\Migration\\Version010402Date20190107124745' => __DIR__ . '/..' . '/../lib/Migration/Version010402Date20190107124745.php',
         'OCA\\OAuth2\\Settings\\Admin' => __DIR__ . '/..' . '/../lib/Settings/Admin.php',
     );
 
diff --git a/apps/oauth2/lib/Migration/Version010402Date20190107124745.php b/apps/oauth2/lib/Migration/Version010402Date20190107124745.php
new file mode 100644
index 0000000000..487eee49c4
--- /dev/null
+++ b/apps/oauth2/lib/Migration/Version010402Date20190107124745.php
@@ -0,0 +1,49 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2018, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\OAuth2\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\SimpleMigrationStep;
+use OCP\Migration\IOutput;
+
+class Version010402Date20190107124745 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('oauth2_clients');
+		$table->dropIndex('oauth2_client_id_idx');
+		$table->addUniqueIndex(['client_identifier'], 'oauth2_client_id_idx');
+		return $schema;
+	}
+}