diff --git a/src/main/java/org/gcube/dataanalysis/ecoengine/datatypes/PrimitiveTypesList.java b/src/main/java/org/gcube/dataanalysis/ecoengine/datatypes/PrimitiveTypesList.java
index 922f9c6..9eec185 100644
--- a/src/main/java/org/gcube/dataanalysis/ecoengine/datatypes/PrimitiveTypesList.java
+++ b/src/main/java/org/gcube/dataanalysis/ecoengine/datatypes/PrimitiveTypesList.java
@@ -15,6 +15,7 @@ public class PrimitiveTypesList  extends StatisticalType {
 		super(name, description, optional);
 		list = new ArrayList<PrimitiveType>();
 		this.type = type;
+		this.className=className;
 	}
 	
 	public void add(PrimitiveType st){