diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
index 6cbf3df..85aab2c 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
@@ -32,7 +32,7 @@ import com.google.gwt.user.client.rpc.AsyncCallback;
 
 public interface TDGWTServiceAsync {
 
-	public TDGWTServiceAsync INSTANCE = GWT
+	public TDGWTServiceAsync INSTANCE = (TDGWTServiceAsync) GWT
 			.create(TDGWTService.class);
 
 	void createTabularResource(TabResource tabResource,AsyncCallback<TabResource> callback);