diff --git a/src/App.vue b/src/App.vue
index e8a5f7a42e282916691183588575bd8719291925..dc9a09c6285cdbb4e91fbb8144b20ca61ee2baea 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -63,7 +63,7 @@ export default {
     },
     shuffleDeck() {
       for (let i = this.deck.length - 1; i > 0; i--) {
-        const j = Math.floor(Math.random() * (i   1))
+        const j = Math.floor(Math.random() * (i  + 1))
         const temp = this.deck[i]
         this.deck[i] = this.deck[j]
         this.deck[j] = temp