diff --git a/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp b/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
index 6df257b7135b..a5b684cd6db3 100644
--- a/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
+++ b/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
@@ -887,6 +887,7 @@ virtual TStatus HandleCreateTable(TKiCreateTable create, TExprContext& ctx) over
 
                         columnMeta.DefaultFromSequence = "_serial_column_" + columnMeta.Name;
                         columnMeta.SetDefaultFromSequence();
+                        columnMeta.NotNull = true;
                     } else if (constraint.Name().Value() == "not_null") {
                         columnMeta.NotNull = true;
                     }
diff --git a/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp b/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
index 35188818625d..46e25ebdad99 100644
--- a/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
+++ b/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
@@ -256,7 +256,7 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
                                        result.GetIssues().ToString());
             CompareYson(R"(
                     [
-                        [[1];["New"]]
+                        [1;["New"]]
                     ]
                 )",
                 NYdb::FormatResultSetYson(result.GetResultSet(0)));