diff --git a/modules/gui/src/com/haulmont/cuba/gui/data/CollectionDatasource.java b/modules/gui/src/com/haulmont/cuba/gui/data/CollectionDatasource.java
index c624ccf5fb..0ee0b096a7 100644
--- a/modules/gui/src/com/haulmont/cuba/gui/data/CollectionDatasource.java
+++ b/modules/gui/src/com/haulmont/cuba/gui/data/CollectionDatasource.java
@@ -475,7 +475,7 @@ public interface CollectionDatasource<T extends Entity<K>, K> extends Datasource
         /**
          * Enclosed collection changed.
          */
-        void collectionChanged(CollectionChangeEvent<? extends T, K> e);
+        void collectionChanged(CollectionChangeEvent<T, K> e);
     }
 
     void addCollectionChangeListener(CollectionChangeListener<? super T, K> listener);