diff --git a/ydb/core/mind/bscontroller/group_mapper_ut.cpp b/ydb/core/mind/bscontroller/group_mapper_ut.cpp
index a611f44d4e78..714967e7fd5c 100644
--- a/ydb/core/mind/bscontroller/group_mapper_ut.cpp
+++ b/ydb/core/mind/bscontroller/group_mapper_ut.cpp
@@ -551,8 +551,8 @@ class TTestContext {
 Y_UNIT_TEST_SUITE(TGroupMapperTest) {
 
     Y_UNIT_TEST(MapperSequentialCalls) {
-        TTestContext globalContext(3, 4, 20, 5, 4);
-        TTestContext localContext(3, 4, 20, 5, 4);
+        TTestContext globalContext(3, 3, 4, 3, 4);
+        TTestContext localContext(3, 3, 4, 3, 4);
 
         TGroupMapper globalMapper(TTestContext::CreateGroupGeometry(TBlobStorageGroupType::Erasure4Plus2Block, 1, 8, 2));
         globalContext.PopulateGroupMapper(globalMapper, 16);