diff --git a/ydb/core/kqp/ut/common/kqp_ut_common.cpp b/ydb/core/kqp/ut/common/kqp_ut_common.cpp
index 9a298ef4eba5..11de0b37da9e 100644
--- a/ydb/core/kqp/ut/common/kqp_ut_common.cpp
+++ b/ydb/core/kqp/ut/common/kqp_ut_common.cpp
@@ -122,7 +122,6 @@ TKikimrRunner::TKikimrRunner(const TKikimrSettings& settings) {
     appConfig.MutableColumnShardConfig()->SetDisabledOnSchemeShard(false);
     ServerSettings->SetAppConfig(appConfig);
     ServerSettings->SetFeatureFlags(settings.FeatureFlags);
-    ServerSettings->FeatureFlags.SetEnableImmediateWritingOnBulkUpsert(true);
     ServerSettings->SetNodeCount(settings.NodeCount);
     ServerSettings->SetEnableKqpSpilling(enableSpilling);
     ServerSettings->SetEnableDataColumnForIndexTable(true);
diff --git a/ydb/core/kqp/ut/common/kqp_ut_common.h b/ydb/core/kqp/ut/common/kqp_ut_common.h
index b993db17210b..313191817895 100644
--- a/ydb/core/kqp/ut/common/kqp_ut_common.h
+++ b/ydb/core/kqp/ut/common/kqp_ut_common.h
@@ -98,7 +98,6 @@ struct TKikimrSettings: public TTestFeatureFlagsHolder<TKikimrSettings> {
         exchangerSettings->SetMaxDelayMs(10);
         AppConfig.MutableColumnShardConfig()->SetDisabledOnSchemeShard(false);
         FeatureFlags.SetEnableSparsedColumns(true);
-        FeatureFlags.SetEnableImmediateWritingOnBulkUpsert(true);
         FeatureFlags.SetEnableWritePortionsOnInsert(true);
         FeatureFlags.SetEnableParameterizedDecimal(true);
         FeatureFlags.SetEnableTopicAutopartitioningForCDC(true);
diff --git a/ydb/core/kqp/ut/olap/write_ut.cpp b/ydb/core/kqp/ut/olap/write_ut.cpp
index c339990668bd..6d13f7802dcd 100644
--- a/ydb/core/kqp/ut/olap/write_ut.cpp
+++ b/ydb/core/kqp/ut/olap/write_ut.cpp
@@ -24,7 +24,6 @@ Y_UNIT_TEST_SUITE(KqpOlapWrite) {
 
         auto settings = TKikimrSettings().SetWithSampleTables(false);
         TKikimrRunner kikimr(settings);
-        kikimr.GetTestServer().GetRuntime()->GetAppData().FeatureFlags.SetEnableImmediateWritingOnBulkUpsert(true);
         kikimr.GetTestServer().GetRuntime()->GetAppData().FeatureFlags.SetEnableWritePortionsOnInsert(true);
         TLocalHelper(kikimr).CreateTestOlapTable();
         Tests::NCommon::TLoggerInit(kikimr)
diff --git a/ydb/core/protos/feature_flags.proto b/ydb/core/protos/feature_flags.proto
index 32137545f946..451da4bcd7a4 100644
--- a/ydb/core/protos/feature_flags.proto
+++ b/ydb/core/protos/feature_flags.proto
@@ -157,7 +157,7 @@ message TFeatureFlags {
     optional bool EnableExternalDataSourcesOnServerless = 143 [default = true];
     optional bool EnableSparsedColumns = 144 [default = false];
     optional bool EnableParameterizedDecimal = 145 [default = false];
-    optional bool EnableImmediateWritingOnBulkUpsert = 146 [default = false];
+    optional bool EnableImmediateWritingOnBulkUpsert = 146 [default = true];
     optional bool EnableInsertWriteIdSpecialColumnCompatibility = 147 [default = false];
     optional bool EnableTopicAutopartitioningForCDC = 148 [default = false];
     optional bool EnableWritePortionsOnInsert = 149 [default = false];
diff --git a/ydb/core/testlib/test_client.h b/ydb/core/testlib/test_client.h
index 31af8c606eb3..3e6762c2c100 100644
--- a/ydb/core/testlib/test_client.h
+++ b/ydb/core/testlib/test_client.h
@@ -252,7 +252,6 @@ namespace Tests {
             AppConfig->MutableHiveConfig()->SetObjectImbalanceToBalance(100);
             AppConfig->MutableColumnShardConfig()->SetDisabledOnSchemeShard(false);
             FeatureFlags.SetEnableSeparationComputeActorsFromRead(true);
-            FeatureFlags.SetEnableImmediateWritingOnBulkUpsert(true);
             FeatureFlags.SetEnableWritePortionsOnInsert(true);
         }