diff --git a/js/src/forum/extenders/extendDiscussionListState.tsx b/js/src/forum/extenders/extendDiscussionListState.tsx
index a43e8ae..9fa3235 100644
--- a/js/src/forum/extenders/extendDiscussionListState.tsx
+++ b/js/src/forum/extenders/extendDiscussionListState.tsx
@@ -1,9 +1,10 @@
 import app from 'flarum/forum/app';
 import { extend } from 'flarum/common/extend';
 import DiscussionListState from 'flarum/forum/states/DiscussionListState';
+import type { PaginatedListParams } from 'flarum/common/states/PaginatedListState';
 
 export default function extendDiscussionListState() {
-  extend(DiscussionListState.prototype, 'requestParams', function (params) {
+  extend(DiscussionListState.prototype, 'requestParams', function (params: PaginatedListParams) {
     if (app.discussions.bestAnswer) {
       const negate = app.discussions.bestAnswer === '2';
       const prepend = negate ? '-' : '';
@@ -12,7 +13,7 @@ export default function extendDiscussionListState() {
         params.filter = {};
       }
 
-      (params.filter as Record<string, string>)[`${prepend}solved-discussions`] = 'true';
+      (params.filter)[`${prepend}solved-discussions`] = 'true';
 
       if (params.filter.q) {
         params.filter.q += ` ${prepend}is:solved`;