diff --git a/src/components/keyboard.tsx b/src/components/keyboard.tsx
index a38a275..b3792b5 100644
--- a/src/components/keyboard.tsx
+++ b/src/components/keyboard.tsx
@@ -19,7 +19,7 @@ export const Keyboard = ({ onChange }) => {
         if (typeof key === 'string') {
             onChange(v => v + key.toUpperCase());
         } else {
-            onChange(v => v.split('').slice(0, -1).join(''))
+            onChange(v => v.slice(0, -1))
         }
     } 
     return (