diff --git a/headers/mySprite.h b/headers/mySprite.h
index 3f83c04..b2a67a1 100644
--- a/headers/mySprite.h
+++ b/headers/mySprite.h
@@ -4,7 +4,7 @@
 #include <future>
 #include <optional>
 #include "mingl/gui/sprite.h"
-#include "pixelManager/pixelManager.h"
+#include "utils.h"
 
 using namespace std;
 
@@ -13,8 +13,11 @@ public:
 	/*!
 	 * @brief optional actual Sprite
 	 * We need to use an optional to init the object through a function, that can be used with std::async
+	 * mutable because for some reason MinGL stores a Vec2D with the pixel data,
+	 * so we modify it each time we need to draw it
+	 * Else, we could copy the Sprite each time, but copying a bunch of images each frame doesn't seems like a good idea
 	 */
-	optional<nsGui::Sprite> sp;
+	mutable optional<nsGui::Sprite> sp;
 
 	/*!
 	 * @brief load a sprite asynchronously
diff --git a/headers/pixelManager/pixelManager.h b/headers/pixelManager/pixelManager.h
index 3baa9ae..06894b7 100644
--- a/headers/pixelManager/pixelManager.h
+++ b/headers/pixelManager/pixelManager.h
@@ -44,9 +44,6 @@ typedef nsGui::GlutFont::GlutFonts Font;
 #define ADD_SPRITE_TASK(X) ADD_SPRITE_TASK2(X, X)
 #define ADD_SPRITE_TASK2(X, Y) tasks.push_back((X).asyncLoad("assets/"#Y".si2"));
 
-typedef future<void> Task;
-
-
 class PixelManager{
 public:
 	MinGL& window;
diff --git a/headers/utils.h b/headers/utils.h
index b0d4f84..fb08df9 100644
--- a/headers/utils.h
+++ b/headers/utils.h
@@ -12,6 +12,7 @@
 #define GUARD_UTILS_H
 
 #include<vector>
+#include<future>
 #include "mingl/mingl.h"
 
 // hardcoded values
@@ -49,9 +50,11 @@ enum class WinValue{
 
 typedef nsGraphics::Vec2D Position;
 typedef unsigned playerID;
+typedef future<void> Task;
 #define PLAYER1 0
 #define PLAYER2 1
 
+
 /*!
  * @brief tells if 2 lines are colliding in a 1 dimensional space. Didn't want to use Position because of the semantic with x and y
  * @param[in] start1 : position of the first point of the first line
diff --git a/src/mySprite.cpp b/src/mySprite.cpp
index c15c1c2..614f26e 100644
--- a/src/mySprite.cpp
+++ b/src/mySprite.cpp
@@ -4,7 +4,7 @@
 Task MySprite::asyncLoad(const string& fname){
 	DEBUG_MSG("Load file " << fname)
 	return std::async(std::launch::async, [fname, this]() -> void {
-		sp = std::make_unique<nsGui::Sprite>(fname);
+		sp.emplace(fname);
 	});
 }
 
@@ -23,5 +23,5 @@ void MySprite::mirror(MySprite& msp) {
 			outPixels.push_back(inPixels[rowOffset + rowSize - j - 1]);
 		}
 	}
-	sp = std::make_unique<nsGui::Sprite>(outPixels, rowSize);
+	sp.emplace(outPixels, rowSize);
 }