diff --git a/source/game/entities/balloon.cpp b/source/game/entities/balloon.cpp
index 7e9c85c..928c2c3 100644
--- a/source/game/entities/balloon.cpp
+++ b/source/game/entities/balloon.cpp
@@ -9,7 +9,7 @@
 #include "game/defaults.hpp"                // for PLAY_AREA_LEFT, PLAY_AREA_RIGHT, PLAY_AR...
 
 // Constructor
-Balloon::Balloon(float x, float y, Uint8 kind, float velx, float speed, Uint16 creationtimer, Texture *texture, std::vector<std::string> *animation, SDL_Renderer *renderer) {
+Balloon::Balloon(float x, float y, Uint8 kind, float velx, float speed, Uint16 creationtimer, Texture *texture, const std::vector<std::string> *animation, SDL_Renderer *renderer) {
     sprite_ = new AnimatedSprite(texture, renderer, "", animation);
     disable();
 
diff --git a/source/game/entities/balloon.h b/source/game/entities/balloon.h
index 57547cb..6a1e658 100644
--- a/source/game/entities/balloon.h
+++ b/source/game/entities/balloon.h
@@ -60,8 +60,8 @@ class Balloon {
     static constexpr int POWERBALL_SCREENPOWER_MINIMUM = 10;
     static constexpr int POWERBALL_COUNTER = 8;
 
-    Balloon(float x, float y, Uint8 kind, float velx, float speed, Uint16 creationtimer, Texture *texture, std::vector<std::string> *animation, SDL_Renderer *renderer);  // Constructor
-    ~Balloon();                                                                                                                                                           // Destructor
+    Balloon(float x, float y, Uint8 kind, float velx, float speed, Uint16 creationtimer, Texture *texture, const std::vector<std::string> *animation, SDL_Renderer *renderer);  // Constructor
+    ~Balloon();                                                                                                                                                                 // Destructor
 
     Balloon(const Balloon &) = delete;
     auto operator=(const Balloon &) -> Balloon & = delete;
diff --git a/source/game/entities/item.cpp b/source/game/entities/item.cpp
index 35fa9f7..234bd22 100644
--- a/source/game/entities/item.cpp
+++ b/source/game/entities/item.cpp
@@ -7,7 +7,7 @@
 class Texture;
 
 // Constructor
-Item::Item(Id id, float x, float y, Texture *texture, std::vector<std::string> *animation, SDL_Renderer *renderer) {
+Item::Item(Id id, float x, float y, Texture *texture, const std::vector<std::string> *animation, SDL_Renderer *renderer) {
     sprite_ = new AnimatedSprite(texture, renderer, "", animation);
 
     this->id_ = id;
diff --git a/source/game/entities/item.h b/source/game/entities/item.h
index 17fd763..62db6eb 100644
--- a/source/game/entities/item.h
+++ b/source/game/entities/item.h
@@ -23,8 +23,8 @@ class Item {
         COFFEE_MACHINE = 6,
     };
 
-    Item(Id id, float x, float y, Texture *texture, std::vector<std::string> *animation, SDL_Renderer *renderer);  // Constructor
-    ~Item();                                                                                                       // Destructor
+    Item(Id id, float x, float y, Texture *texture, const std::vector<std::string> *animation, SDL_Renderer *renderer);  // Constructor
+    ~Item();                                                                                                             // Destructor
 
     Item(const Item &) = delete;
     auto operator=(const Item &) -> Item & = delete;