diff --git a/types/options.d.ts b/types/options.d.ts
index 5a9cd4bf..44fe8b01 100644
--- a/types/options.d.ts
+++ b/types/options.d.ts
@@ -43,7 +43,7 @@ export interface CoreAnnotationOptions extends AnnotationEvents, ShadowOptions,
   display?: Scriptable<boolean, PartialEventContext>,
   drawTime?: Scriptable<DrawTime, PartialEventContext>,
   hitTolerance?: Scriptable<number, PartialEventContext>,
-  init?: boolean | (({ chart: Chart, properties: AnnotationBoxModel, options: AnnotationOptions }) => void | boolean | AnnotationElement),
+  init?: boolean | (({ chart: Chart, properties: AnnotationBoxModel, options: AnnotationOptions }) => void | boolean | Partial<AnnotationElement>),
   id?: string,
   xMax?: Scriptable<ScaleValue, PartialEventContext>,
   xMin?: Scriptable<ScaleValue, PartialEventContext>,