diff --git a/5kyu/a-chain-adding-function/solution.ts b/5kyu/a-chain-adding-function/solution.ts
index 9ddc007..56b8e5b 100644
--- a/5kyu/a-chain-adding-function/solution.ts
+++ b/5kyu/a-chain-adding-function/solution.ts
@@ -1,5 +1,5 @@
 
-export default function add(x: number): any {
+export default function add(x: number) {
   const sum = (y: number): any => add(x + y);
   // set .valueOf to return the current sum when the object is coerced to a primitive
   // for example, when it is compared to a number