diff --git a/src/remote/activitypub/act/create.ts b/src/remote/activitypub/act/create.ts
index a6ba9a1d2b..fa681982cf 100644
--- a/src/remote/activitypub/act/create.ts
+++ b/src/remote/activitypub/act/create.ts
@@ -1,6 +1,7 @@
 import create from '../create';
+import Resolver from '../resolver';
 
-export default (resolver, actor, activity, distribute) => {
+export default (resolver: Resolver, actor, activity, distribute) => {
 	if ('actor' in activity && actor.account.uri !== activity.actor) {
 		throw new Error();
 	}
diff --git a/src/remote/activitypub/act/follow.ts b/src/remote/activitypub/act/follow.ts
index 385fc58efe..23fa41df8e 100644
--- a/src/remote/activitypub/act/follow.ts
+++ b/src/remote/activitypub/act/follow.ts
@@ -7,8 +7,9 @@ import queue from '../../../queue';
 import context from '../renderer/context';
 import renderAccept from '../renderer/accept';
 import request from '../../request';
+import Resolver from '../resolver';
 
-export default async (resolver, actor, activity, distribute) => {
+export default async (resolver: Resolver, actor, activity, distribute) => {
 	const prefix = config.url + '/@';
 	const id = activity.object.id || activity.object;
 
diff --git a/src/remote/activitypub/act/index.ts b/src/remote/activitypub/act/index.ts
index 3b7dd5b249..2af1902215 100644
--- a/src/remote/activitypub/act/index.ts
+++ b/src/remote/activitypub/act/index.ts
@@ -2,8 +2,9 @@ import create from './create';
 import follow from './follow';
 import undo from './undo';
 import createObject from '../create';
+import Resolver from '../resolver';
 
-export default (resolver, actor, value, distribute?: boolean) => {
+export default (resolver: Resolver, actor, value, distribute?: boolean) => {
 	return resolver.resolve(value).then(resolved => Promise.all(resolved.map(async promisedResult => {
 		const result = await promisedResult;
 		const created = await (await createObject(result.resolver, actor, [result.object], distribute))[0];
diff --git a/src/remote/activitypub/act/undo/index.ts b/src/remote/activitypub/act/undo/index.ts
index c34d56e704..d104eeb80c 100644
--- a/src/remote/activitypub/act/undo/index.ts
+++ b/src/remote/activitypub/act/undo/index.ts
@@ -1,7 +1,8 @@
 import act from '../../act';
 import unfollow from './unfollow';
+import Resolver from '../../resolver';
 
-export default async (resolver, actor, activity) => {
+export default async (resolver: Resolver, actor, activity) => {
 	if ('actor' in activity && actor.account.uri !== activity.actor) {
 		throw new Error();
 	}