diff --git a/src/remote/activitypub/act/undo/index.ts b/src/remote/activitypub/act/undo/index.ts
index d104eeb80c..38d5bfe211 100644
--- a/src/remote/activitypub/act/undo/index.ts
+++ b/src/remote/activitypub/act/undo/index.ts
@@ -9,7 +9,9 @@ export default async (resolver: Resolver, actor, activity) => {
 
 	const results = await act(resolver, actor, activity.object);
 
-	await Promise.all(results.map(async result => {
+	await Promise.all(results.map(async promisedResult => {
+		const result = await promisedResult;
+
 		if (result === null) {
 			return;
 		}