diff --git a/client/src/components/vbox.component.jsx b/client/src/components/vbox.component.jsx
index 9fa63095..4cafc89d 100644
--- a/client/src/components/vbox.component.jsx
+++ b/client/src/components/vbox.component.jsx
@@ -257,7 +257,7 @@ class Vbox extends preact.Component {
                         class='vbox-btn'
                         onMouseOver={e => hoverInfo(e, 'refill')}
                         disabled={vbox.bits < 2
-                            || tutorial && tutorial < 7 && instance.time_control === 'Practice' && instance.rounds.length === 1
+                            || (tutorial && tutorial < 7 && instance.time_control === 'Practice' && instance.rounds.length === 1)
                         }
                         onClick={e => e.stopPropagation()}
                         onMouseDown={() => sendVboxDiscard()}>