diff --git a/.travis.yml b/.travis.yml
index d2e0af6..0c2a0e4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
 
 services:
   - mysql
@@ -15,6 +16,10 @@ env:
   - DB=pgsql RUNLEVEL=0
   - DB=pgsql RUNLEVEL=10
 
+matrix:
+    allow_failures:
+        - php: 7.2
+
 before_script:
   - composer selfupdate --no-progress
   - travis_retry composer install --prefer-dist
diff --git a/src/ContainerFactory.php b/src/ContainerFactory.php
index 24ad7da..ff1910d 100644
--- a/src/ContainerFactory.php
+++ b/src/ContainerFactory.php
@@ -5,8 +5,9 @@
 /**
  * @internal
  */
-class ContainerFactory extends \Nette\Object
+class ContainerFactory
 {
+	use \Nette\SmartObject;
 
 	private static $container;