diff --git a/client/src/app/install/install-step-3-database.js b/client/src/app/install/install-step-3-database.js
index edb2b9ab..85240d3a 100644
--- a/client/src/app/install/install-step-3-database.js
+++ b/client/src/app/install/install-step-3-database.js
@@ -1,4 +1,5 @@
 import React from 'react';
+import _ from 'lodash';
 
 import history from 'lib-app/history';
 import i18n from 'lib-app/i18n';
@@ -64,7 +65,7 @@ class InstallStep3Database extends React.Component {
         }, () => {
             API.call({
                 path: '/system/init-database',
-                data: form
+                data: _.extend({}, form, {dbPort: form.dbPort || 3306})
             })
                 .then(() => history.push('/install/step-4'))
                 .catch(({message}) => this.setState({
diff --git a/server/controllers/system/init-database.php b/server/controllers/system/init-database.php
index f6fea28e..b62aa61c 100755
--- a/server/controllers/system/init-database.php
+++ b/server/controllers/system/init-database.php
@@ -14,7 +14,8 @@ use RedBeanPHP\Facade as RedBean;
  *
  * @apiPermission any
  *
- * @apiParam {String} dbHost Url of the database server.
+ * @apiParam {String} dbHost Location of the database server.
+ * @apiParam {String} dbPort Port of the database server.
  * @apiParam {String} dbName Name of the database. If not given, the system will try to create one.
  * @apiParam {String} dbUser User of the database server.
  * @apiParam {String} dbPassword Password of the database server.