diff --git a/get_next_line.h b/get_next_line.h
index 7b88703..b440a74 100644
--- a/get_next_line.h
+++ b/get_next_line.h
@@ -6,7 +6,7 @@
 /*   By: cchauvet <cchauvet@student.42angouleme.fr  +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/11/14 15:38:06 by cchauvet          #+#    #+#             */
-/*   Updated: 2022/11/14 16:11:37 by cchauvet         ###   ########.fr       */
+/*   Updated: 2022/11/14 17:28:39 by cchauvet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,7 +14,9 @@
 # define GET_NEXT_LINE_H
 # include <stdlib.h>
 # include <unistd.h>
-# define BUFFER_SIZE 42
+# ifndef BUFFER_SIZE
+#  define BUFFER_SIZE 42
+# endif
 
 void	*ft_calloc(size_t nmemb, size_t size);
 void	*ft_realloc(void *ptr, size_t size);
diff --git a/get_next_line_bonus.h b/get_next_line_bonus.h
index 69d5549..3507192 100644
--- a/get_next_line_bonus.h
+++ b/get_next_line_bonus.h
@@ -6,7 +6,7 @@
 /*   By: cchauvet <cchauvet@student.42angouleme.fr  +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/11/14 15:38:06 by cchauvet          #+#    #+#             */
-/*   Updated: 2022/11/14 16:11:10 by cchauvet         ###   ########.fr       */
+/*   Updated: 2022/11/14 17:29:19 by cchauvet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,7 +14,9 @@
 # define GET_NEXT_LINE_BONUS_H
 # include <stdlib.h>
 # include <unistd.h>
-# define BUFFER_SIZE 42
+# ifndef BUFFER_SIZE
+#  define BUFFER_SIZE 42
+# endif
 
 void	*ft_calloc(size_t nmemb, size_t size);
 void	*ft_realloc(void *ptr, size_t size);