diff --git a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/genRollupSelectv2.ts b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/genRollupSelectv2.ts
index f1d52f357f..d5631ee3cb 100644
--- a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/genRollupSelectv2.ts
+++ b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/genRollupSelectv2.ts
@@ -29,7 +29,7 @@ export default async function ({
     case RelationTypes.HAS_MANY:
       return {
         builder: knex(`${childModel?.table_name} as ${refTableAlias}`)
-          [columnOptions.rollup_function]?.(
+          [columnOptions.rollup_function as string]?.(
             knex.ref(`${refTableAlias}.${rollupColumn.column_name}`)
           )
           .where(
@@ -47,7 +47,7 @@ export default async function ({
 
       return {
         builder: knex(`${parentModel?.table_name} as ${refTableAlias}`)
-          [columnOptions.rollup_function]?.(
+          [columnOptions.rollup_function as string]?.(
             knex.ref(`${refTableAlias}.${rollupColumn.column_name}`)
           )
           .innerJoin(
diff --git a/packages/nocodb/src/lib/models/RollupColumn.ts b/packages/nocodb/src/lib/models/RollupColumn.ts
index a9194dd469..3781cc4a7e 100644
--- a/packages/nocodb/src/lib/models/RollupColumn.ts
+++ b/packages/nocodb/src/lib/models/RollupColumn.ts
@@ -5,19 +5,22 @@ import NocoCache from '../cache/NocoCache';
 import { extractProps } from '../meta/helpers/extractProps';
 import type { RollupType } from 'nocodb-sdk';
 
+export const ROLLUP_FUNCTIONS = <const>[
+  'count',
+  'min',
+  'max',
+  'avg',
+  'countDistinct',
+  'sumDistinct',
+  'avgDistinct',
+];
+
 export default class RollupColumn implements RollupType {
   id: string;
   fk_column_id;
   fk_relation_column_id;
   fk_rollup_column_id;
-  rollup_function:
-    | 'count'
-    | 'min'
-    | 'max'
-    | 'avg'
-    | 'countDistinct'
-    | 'sumDistinct'
-    | 'avgDistinct';
+  rollup_function: typeof ROLLUP_FUNCTIONS[number];
 
   constructor(data: Partial<RollupColumn>) {
     Object.assign(this, data);
diff --git a/packages/nocodb/src/lib/version-upgrader/ncProjectUpgraderV2_0090000.ts b/packages/nocodb/src/lib/version-upgrader/ncProjectUpgraderV2_0090000.ts
index 4bd94c8574..49433e8475 100644
--- a/packages/nocodb/src/lib/version-upgrader/ncProjectUpgraderV2_0090000.ts
+++ b/packages/nocodb/src/lib/version-upgrader/ncProjectUpgraderV2_0090000.ts
@@ -14,7 +14,7 @@ import {
 import Column from '../models/Column';
 import LinkToAnotherRecordColumn from '../models/LinkToAnotherRecordColumn';
 import NcHelp from '../utils/NcHelp';
-import RollupColumn from '../models/RollupColumn';
+import RollupColumn, { ROLLUP_FUNCTIONS } from '../models/RollupColumn';
 import View from '../models/View';
 import GridView from '../models/GridView';
 import KanbanView from '../models/KanbanView';
@@ -613,7 +613,8 @@ async function migrateProjectModels(
 
               const colBody: Partial<RollupColumn & Column> = {
                 title: columnMeta._cn,
-                rollup_function: columnMeta.rl.fn,
+                rollup_function: columnMeta.rl
+                  .fn as typeof ROLLUP_FUNCTIONS[number],
               };
 
               colBody.fk_rollup_column_id =