diff --git a/packages/backend/test-federation/test/user.test.ts b/packages/backend/test-federation/test/user.test.ts
index 76605e61d4..df6f8c10e0 100644
--- a/packages/backend/test-federation/test/user.test.ts
+++ b/packages/backend/test-federation/test/user.test.ts
@@ -43,12 +43,11 @@ describe('User', () => {
 					'uri',
 					'createdAt',
 					'lastFetchedAt',
-					'publicReactions',
 				]);
 			});
 		});
 
-		describe('ffVisibility is federated', () => {
+		describe('ff/reactions visibility is federated', () => {
 			let alice: LoginUser, bob: LoginUser;
 			let bobInA: Misskey.entities.UserDetailedNotMe, aliceInB: Misskey.entities.UserDetailedNotMe;
 
@@ -78,6 +77,7 @@ describe('User', () => {
 				])) {
 					strictEqual(user.followersVisibility, 'public');
 					strictEqual(user.followingVisibility, 'public');
+					strictEqual(user.publicReactions, true);
 				}
 			});
 
@@ -113,6 +113,22 @@ describe('User', () => {
 					strictEqual(user.followingVisibility, 'private');
 				}
 			});
+
+			test('Setting false for publicReactions is federated', async () => {
+				await Promise.all([
+					alice.client.request('i/update', { publicReactions: false }),
+					bob.client.request('i/update', { publicReactions: false }),
+				]);
+				await sleep();
+
+				for (const user of await Promise.all([
+					alice.client.request('users/show', { userId: bobInA.id }),
+					bob.client.request('users/show', { userId: aliceInB.id }),
+				])) {
+					strictEqual(user.publicReactions, false);
+					strictEqual(user.publicReactions, false);
+				}
+			});
 		});
 
 		describe('isCat is federated', () => {