diff --git a/src/04-generics-advanced/20.7-working-around-partial-inference.problem.ts b/src/04-generics-advanced/20.7-working-around-partial-inference.problem.ts
index 24f0f38..9d904cb 100644
--- a/src/04-generics-advanced/20.7-working-around-partial-inference.problem.ts
+++ b/src/04-generics-advanced/20.7-working-around-partial-inference.problem.ts
@@ -2,7 +2,7 @@ import { Equal, Expect } from "../helpers/type-utils";
 
 export const makeSelectors = <
   TSource,
-  TSelectors extends Record<string, (source: TSource) => any> = {},
+  TSelectors extends Record<string, (source: TSource) => any>,
 >(
   selectors: TSelectors,
 ) => {