diff --git a/common/src/main/java/com/genexus/GXExternalCollection.java b/common/src/main/java/com/genexus/GXExternalCollection.java
index 09b50bde5..949e01cd5 100644
--- a/common/src/main/java/com/genexus/GXExternalCollection.java
+++ b/common/src/main/java/com/genexus/GXExternalCollection.java
@@ -100,13 +100,13 @@ public Vector getStruct()
 	}
 
 	@SuppressWarnings("unchecked")
-	public ArrayList getExternalInstance() {
-		ArrayList list = new ArrayList();
+	public <E> ArrayList<E> getExternalInstance() {
+		ArrayList<E> list = new ArrayList<>();
 		for (T Item : this)
 		{
 			try
 			{
-				list.add(Item.getClass().getMethod("getExternalInstance", new Class[]{}).invoke(Item));
+				list.add((E) Item.getClass().getMethod("getExternalInstance", new Class[]{}).invoke(Item));
 			}
 			catch (Exception e)
 			{