diff --git a/src/pong.ts b/src/pong.ts
index cc1200b..89ed43a 100644
--- a/src/pong.ts
+++ b/src/pong.ts
@@ -122,7 +122,7 @@ class PongCore {
 
     // Simulate game logic
     simulate() {
-        if (this.ball.dx > 0) {
+        if (this.ball.dx < 0) {
             this.botInput(this.left);
             this.botIdle(this.right);
         } else {