diff --git a/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx b/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx
index 2c18d3069..320735907 100644
--- a/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx
+++ b/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx
@@ -852,7 +852,7 @@ describe('fetchBaseQuery', () => {
     })
 
     test('prepareHeaders provides args', async () => {
-      let _args
+      let _args: any
 
       const baseQuery = fetchBaseQuery({
         baseUrl,