diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
index 2da2c3d..d19338a 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
@@ -11,6 +11,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
 import org.apache.log4j.Logger;
@@ -83,7 +84,6 @@ import org.gcube.portlets.user.workspace.shared.accounting.GxtAccountingEntryTyp
 import org.gcube.portlets.user.workspace.shared.accounting.GxtAccountingField;
 import org.gcube.vomanagement.usermanagement.model.UserModel;
 
-import com.google.gwt.user.client.Random;
 import com.thoughtworks.xstream.XStream;
 
 
@@ -212,7 +212,7 @@ public class GWTWorkspaceBuilder {
 		sb.append("&type=");
 		sb.append(requestType.toString());
 		sb.append("&random=");
-		sb.append(Random.nextInt()+""+Random.nextInt()+""+Random.nextInt());
+		sb.append(UUID.randomUUID().toString());
 		return sb.toString();
 	}