diff --git a/src/js/control-view.js b/src/js/control-view.js
index fbd3a8e..61079c4 100644
--- a/src/js/control-view.js
+++ b/src/js/control-view.js
@@ -198,7 +198,7 @@ module.exports = {
             }
 
             const p = this.plan_time / this.toolpath.time;
-            return Math.max(1, p);
+            return Math.min(1, p);
         }
     },