diff --git a/main.cpp b/main.cpp
index c2e5e7f..1e89144 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,7 +5,7 @@ int main() {
     Engine engine;
     Ball ball;
 
-    engine.balls.push_back(ball);
+    engine.addObject(&ball);
     engine.start();
 
     return 0;