diff --git a/src/components/inputItem.vue b/src/components/inputItem.vue
index 99bc6e7..9181989 100644
--- a/src/components/inputItem.vue
+++ b/src/components/inputItem.vue
@@ -16,8 +16,8 @@ export default defineComponent({
   setup() {
 
     // Cords of inputItem.
-    let inputItemX = ref(0)
-    let inputItemY = ref(0)
+    const inputItemX = ref(0)
+    const inputItemY = ref(0)
 
     // Position of inputItem on terms of percentage of window.
     let percentX: number