diff --git a/java/com.sap.sse.security/src/com/sap/sse/security/PreferenceObjectBasedNotificationSet.java b/java/com.sap.sse.security/src/com/sap/sse/security/PreferenceObjectBasedNotificationSet.java
index 2e0ed013d68..6555e5951c9 100644
--- a/java/com.sap.sse.security/src/com/sap/sse/security/PreferenceObjectBasedNotificationSet.java
+++ b/java/com.sap.sse.security/src/com/sap/sse/security/PreferenceObjectBasedNotificationSet.java
@@ -80,6 +80,7 @@ public abstract class PreferenceObjectBasedNotificationSet<PrefT, T> implements
             this.tracker = null;
         } else {
             this.tracker = new ServiceTracker<UserStore, UserStore>(context, UserStore.class, new Cutomizer());
+            this.tracker.open();
         }
         this.lock = new NamedReentrantReadWriteLock(getClass().getName()+" for "+key, /* fair */ false);
     }