diff --git a/src/Tile/TileReference.php b/src/Tile/TileReference.php
index e4c03dca..58f88efd 100644
--- a/src/Tile/TileReference.php
+++ b/src/Tile/TileReference.php
@@ -4,6 +4,7 @@
 
 use ilContainerReference;
 use ilObjectFactory;
+use ilObject;
 
 /**
  * Class TileReference