diff --git a/.travis.yml b/.travis.yml
index b1860aa9..0c010b7a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,8 @@ language: node_js
 node_js:
   - '10'
   - '11'
+env:
+  - MYSQL_HOST='localhost' MYSQL_PASSWORD='' MYSQL_USERNAME='root' MYSQL_DATABASE='pigallery2_test'
 services:
   - mysql
 addons:
diff --git a/common/config/private/PrivateConfigClass.ts b/common/config/private/PrivateConfigClass.ts
index 585daa0a..0f5dfa4a 100644
--- a/common/config/private/PrivateConfigClass.ts
+++ b/common/config/private/PrivateConfigClass.ts
@@ -63,7 +63,11 @@ export class PrivateConfigClass extends PublicConfigClass implements IPrivateCon
   public load() {
     ConfigLoader.loadBackendConfig(this,
       path.join(__dirname, './../../../config.json'),
-      [['PORT', 'Server-port']]);
+      [['PORT', 'Server-port'],
+        ['MYSQL_HOST', 'Server-database-mysql-host'],
+        ['MYSQL_PASSWORD', 'Server-database-mysql-password'],
+        ['MYSQL_USERNAME', 'Server-database-mysql-username'],
+        ['MYSQL_DATABASE', 'Server-database-mysql-database']]);
 
     if (Utils.enumToArray(UserRoles).map(r => r.key).indexOf(this.Client.unAuthenticatedUserRole) === -1) {
       throw new Error('Unknown user role for Client.unAuthenticatedUserRole, found: ' + this.Client.unAuthenticatedUserRole);