diff --git a/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java b/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
index 3e847a5..ba124bb 100644
--- a/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
+++ b/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
@@ -100,7 +100,7 @@ public class QueryTemplateImpl extends EntityElementImpl implements QueryTemplat
 		for(TemplateVariable tv : templateVariables.values()) {
 			Object defaultValue = tv.getDefaultValue();
 			JsonNode jsonNode = ElementMapper.getObjectMapper().valueToTree(defaultValue);
-			objectNode.put(tv.getName(), jsonNode);
+			objectNode.set(tv.getName(), jsonNode);
 			
 //			if(defaultValue instanceof Integer) {
 //				objectNode.put(tv.getName(), (Integer) defaultValue);