diff --git a/cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/integration/BaseCradleCassandraTest.java b/cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/integration/BaseCradleCassandraTest.java
index de67a52c..4c90dbcf 100644
--- a/cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/integration/BaseCradleCassandraTest.java
+++ b/cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/integration/BaseCradleCassandraTest.java
@@ -168,7 +168,7 @@ protected TestEventToStore generateTestEvent (String scope, Instant start, long
     @NotNull
     protected static Map<PageId, PageInfo> toMap(Collection<PageInfo> result) {
         return result.stream()
-                .collect(Collectors.toMap(
+                .collect(Collectors.toImmutableMap(
                         PageInfo::getId,
                         Function.identity()
                 ));