diff --git a/types/plugin/isoWeek.d.ts b/types/plugin/isoWeek.d.ts
index f8d59b77b..26c591ba6 100644
--- a/types/plugin/isoWeek.d.ts
+++ b/types/plugin/isoWeek.d.ts
@@ -1,9 +1,9 @@
-import { PluginFunc, UnitType, ConfigType } from 'dayjs'
+import { PluginFunc, OpUnitType, ConfigType } from 'dayjs'
 
 declare const plugin: PluginFunc
 export = plugin
 
-type ISOUnitType = UnitType | 'isoWeek';
+type ISOUnitType = OpUnitType | 'isoWeek';
 
 declare module 'dayjs' {
   interface Dayjs {