diff --git a/src/processor/http/process-inbox.ts b/src/processor/http/process-inbox.ts
index 8ceb08257..f102f8d6b 100644
--- a/src/processor/http/process-inbox.ts
+++ b/src/processor/http/process-inbox.ts
@@ -5,7 +5,7 @@ import act from '../../remote/activitypub/act';
 import resolvePerson from '../../remote/activitypub/resolve-person';
 import Resolver from '../../remote/activitypub/resolver';
 
-export default async ({ data }) => {
+export default async ({ data }): Promise<void> => {
 	const keyIdLower = data.signature.keyId.toLowerCase();
 	let user;