Tighten visibility

Change-Id: I5ae3c63d4e8361c488a06f71ff83cb1ff8ca5f4e
diff --git a/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java b/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
index 27e2f2d..b159422 100644
--- a/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
+++ b/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
@@ -436,7 +436,7 @@
     }
 
     // code clone
-    protected static void assertAnnotationsEquals(Annotations actual, SparseAnnotations... annotations) {
+    private static void assertAnnotationsEquals(Annotations actual, SparseAnnotations... annotations) {
         SparseAnnotations expected = DefaultAnnotations.builder().build();
         for (SparseAnnotations a : annotations) {
             expected = DefaultAnnotations.union(expected, a);