diff --git a/src/box.js b/src/box.js
index aea9e40..44954c3 100644
--- a/src/box.js
+++ b/src/box.js
@@ -38,7 +38,7 @@ class Box {
 
     jump(_x, _y) {
         // Put x between -1 and 1
-        let x = (_x - 0.5) * 2;
+        let x = (_x - this.x) * 2;
         let y = _y;
 
         if (this.jumpCounter > 0) {