diff --git a/src/game/World.cpp b/src/game/World.cpp
index a6bd570..04071bd 100644
--- a/src/game/World.cpp
+++ b/src/game/World.cpp
@@ -321,8 +321,8 @@ bool World::saveMap(const std::string& fileName) const {
 
 void World::tick(std::uint64_t delta) {
     moveMobs(delta);
-    for(Tower& tower : m_Towers){
-        tower.tick(delta);
+    for(TowerPtr tower : m_Towers){
+        tower->tick(delta);
     }
 }