diff --git a/Makefile b/Makefile
index 9297378..35569a4 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 #    By: tmaze <marvin@42.fr>                       +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2018/04/04 10:51:59 by tmaze             #+#    #+#              #
-#    Updated: 2018/04/04 15:08:39 by tmaze            ###   ########.fr        #
+#    Updated: 2018/04/04 15:30:28 by tmaze            ###   ########.fr        #
 #                                                                              #
 #******************************************************************************#
 
@@ -18,6 +18,7 @@ NAME = libft.a
 
 SRCS =	\
 		ft_strlen.c  \
+		ft_strdup.c  \
 		ft_isalpha.c \
 		ft_isdigit.c \
 		ft_isalnum.c \
diff --git a/ft_strdup.c b/ft_strdup.c
new file mode 100644
index 0000000..1c216dc
--- /dev/null
+++ b/ft_strdup.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strdup.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tmaze <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2018/04/03 16:33:35 by tmaze             #+#    #+#             */
+/*   Updated: 2018/04/04 15:29:36 by tmaze            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strdup(const char *s1)
+{
+	int		i;
+	char	*ret;
+
+	i = 0;
+	while (s1[i])
+		i++;
+	if ((ret = (char*)malloc(sizeof(char) * (i + 1))) != NULL)
+	{
+		ret[i] = '\0';
+		i = -1;
+		while (s1[++i])
+			ret[i] = s1[i];
+	}
+	return (ret);
+}
diff --git a/libft.h b/libft.h
index 7be4580..bfcea1e 100644
--- a/libft.h
+++ b/libft.h
@@ -6,7 +6,7 @@
 /*   By: tmaze <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2018/04/04 10:40:01 by tmaze             #+#    #+#             */
-/*   Updated: 2018/04/04 10:44:30 by tmaze            ###   ########.fr       */
+/*   Updated: 2018/04/04 15:30:00 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,7 @@
 # define LIBFT_H
 
 # include <string.h>
+# include <stdlib.h>
 
 /*
 ** fonctions obligatoires