diff --git a/src/remote/activitypub/kernel/undo/index.ts b/src/remote/activitypub/kernel/undo/index.ts
index 81decd1256..93909352d9 100644
--- a/src/remote/activitypub/kernel/undo/index.ts
+++ b/src/remote/activitypub/kernel/undo/index.ts
@@ -34,6 +34,7 @@ export default async (actor: IRemoteUser, activity: IUndo): Promise<void> => {
 			break;
 		case 'Like':
 		case 'EmojiReaction':
+		case 'EmojiReact':
 			undoLike(actor, object as ILike);
 			break;
 		case 'Announce':
diff --git a/src/remote/activitypub/type.ts b/src/remote/activitypub/type.ts
index 6ee5349f20..35a0705168 100644
--- a/src/remote/activitypub/type.ts
+++ b/src/remote/activitypub/type.ts
@@ -171,7 +171,7 @@ export interface IRemove extends IActivity {
 }
 
 export interface ILike extends IActivity {
-	type: 'Like' | 'EmojiReaction';
+	type: 'Like' | 'EmojiReaction' | 'EmojiReact';
 	_misskey_reaction?: string;
 }
 
@@ -193,6 +193,6 @@ export const isAccept = (object: IObject): object is IAccept => object.type ===
 export const isReject = (object: IObject): object is IReject => object.type === 'Reject';
 export const isAdd = (object: IObject): object is IAdd => object.type === 'Add';
 export const isRemove = (object: IObject): object is IRemove => object.type === 'Remove';
-export const isLike = (object: IObject): object is ILike => object.type === 'Like' || object.type === 'EmojiReaction';
+export const isLike = (object: IObject): object is ILike => object.type === 'Like' || object.type === 'EmojiReaction' || object.type === 'EmojiReact';
 export const isAnnounce = (object: IObject): object is IAnnounce => object.type === 'Announce';
 export const isBlock = (object: IObject): object is IBlock => object.type === 'Block';