diff --git a/src/main/java/it/finanze/sanita/fse2/ms/edsclient/service/impl/ConfigSRV.java b/src/main/java/it/finanze/sanita/fse2/ms/edsclient/service/impl/ConfigSRV.java
index 2478d73..6c311f4 100644
--- a/src/main/java/it/finanze/sanita/fse2/ms/edsclient/service/impl/ConfigSRV.java
+++ b/src/main/java/it/finanze/sanita/fse2/ms/edsclient/service/impl/ConfigSRV.java
@@ -51,7 +51,7 @@ public void postConstruct() {
     public Boolean isRemoveMetadataEnable() {
         long lastUpdate = props.get(PROPS_NAME_REMOVE_METADATA_ENABLE).getKey();
         if (new Date().getTime() - lastUpdate >= DELTA_MS) {
-            synchronized(ConfigSRV.class) {
+            synchronized(Locks.REMOVE_METADATA_ENABLE) {
                 if (new Date().getTime() - lastUpdate >= DELTA_MS) {
                     refresh(PROPS_NAME_REMOVE_METADATA_ENABLE);
                 }
@@ -94,4 +94,8 @@ private void init() {
         integrity();
     }
 
+    private static final class Locks {
+        public static final Object REMOVE_METADATA_ENABLE = new Object();
+    }
+
 }