diff --git a/src/tictactoe/Square.tsx b/src/tictactoe/Square.tsx
index f5016fd..8dafb64 100644
--- a/src/tictactoe/Square.tsx
+++ b/src/tictactoe/Square.tsx
@@ -1,4 +1,9 @@
-export default function Square({ value, onClick }) {
+interface SquareProps {
+  value: string;
+  onClick: () => void;
+}
+
+export default function Square({ value, onClick } : SquareProps) {
   return (
     <button className="square" onClick={onClick}>
       {value}