diff --git a/src/client/InputHandler.ts b/src/client/InputHandler.ts
index 522536cb9..6f9b9f71a 100644
--- a/src/client/InputHandler.ts
+++ b/src/client/InputHandler.ts
@@ -191,10 +191,12 @@ export class InputHandler {
       }
 
       if (e.code === "Digit1") {
+        e.preventDefault();
         this.eventBus.emit(new AttackRatioEvent(-10));
       }
 
       if (e.code === "Digit2") {
+        e.preventDefault();
         this.eventBus.emit(new AttackRatioEvent(10));
       }