diff --git a/src/main/java/org/gcube/accounting/utility/postgresql/RecordToDBFields.java b/src/main/java/org/gcube/accounting/utility/postgresql/RecordToDBFields.java
index 026ff15..d3bda65 100644
--- a/src/main/java/org/gcube/accounting/utility/postgresql/RecordToDBFields.java
+++ b/src/main/java/org/gcube/accounting/utility/postgresql/RecordToDBFields.java
@@ -35,7 +35,7 @@ public class RecordToDBFields {
 	protected final Map<String, String> tableFieldToRecordField;
 	protected final Map<String, String> recordFieldToTableField;
 		
-	public RecordToDBFields(String typeName, Class<? extends Record> clz) throws Exception {
+	protected RecordToDBFields(String typeName, Class<? extends Record> clz) throws Exception {
 		this.clz = clz;
 		this.typeName = typeName;
 		this.tableName = typeName.toLowerCase();