diff --git a/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceConfiguration.java b/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceConfiguration.java
index 4a1de6d..8620d11 100644
--- a/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceConfiguration.java
+++ b/src/main/java/org/gcube/accounting/persistence/AccountingPersistenceConfiguration.java
@@ -28,8 +28,8 @@ public class AccountingPersistenceConfiguration {
 	protected static final String PERSISTENCE_CLASS_NAME = "persistenceClassName";
 	protected static final String TARGET_SCOPE = "targetScope";
 
-	protected final String SERVICE_ENDPOINT_CATEGORY = "Accounting";
-	protected final String SERVICE_ENDPOINT_NAME = "Persistence";
+	protected static final String SERVICE_ENDPOINT_CATEGORY = "Accounting";
+	protected static final String SERVICE_ENDPOINT_NAME = "Persistence";
 	
 	protected URI uri;
 	protected String username;