diff --git a/app/soapbox/normalizers/account.ts b/app/soapbox/normalizers/account.ts
index bf58f1c815..97c640886c 100644
--- a/app/soapbox/normalizers/account.ts
+++ b/app/soapbox/normalizers/account.ts
@@ -42,7 +42,7 @@ export const AccountRecord = ImmutableRecord({
   location: '',
   locked: false,
   moved: null as EmbeddedEntity<any>,
-  mute_expires_at: null as Date | null,
+  mute_expires_at: null as string | null,
   note: '',
   pleroma: ImmutableMap<string, any>(),
   source: ImmutableMap<string, any>(),