diff --git a/map_drawing.py b/map_drawing.py
index 460d47b..8c74746 100644
--- a/map_drawing.py
+++ b/map_drawing.py
@@ -17,6 +17,7 @@
 ############################################
 #Importation des modules:
 import pygame
+import math
 
 ############################################
 #definition des constantes :
@@ -25,7 +26,7 @@
 ############################################
 #definition de la fonction d'affichage :
 def ShowMap (map_size,path_coords):
-    box_size_pixel=((map_size_pixel[0]/map_size[0]),(map_size_pixel[1]/map_size[1]))
+    box_size_pixel=(math.floor(map_size_pixel[0]/map_size[0]),math.floor(map_size_pixel[1]/map_size[1]))
     map_surface=pygame.Surface(map_size_pixel)
     for column in range (1,map_size[0]+1):
         for row in range (1,map_size[1]+1):