diff --git a/test_printf.c b/test_printf.c
index 2ef296b..61b76a0 100644
--- a/test_printf.c
+++ b/test_printf.c
@@ -6,7 +6,7 @@
 /*   By: lalgarra <lalgarra@student.42madrid.com>   +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/15 18:54:32 by lalgarra          #+#    #+#             */
-/*   Updated: 2025/10/17 18:46:01 by lalgarra         ###   ########.fr       */
+/*   Updated: 2025/10/17 20:22:55 by lalgarra         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -95,6 +95,23 @@ static void test03()
 	test_int(prefix, sfmt, 9123325);
 }
 
+static void test04()
+{
+	char	prefix[128];
+	char	sfmt[128];
+	int 	ret;
+
+	strcpy(prefix, "test04: ");
+	strcpy(sfmt, "%%s: NULL %s NULL; %%p: %p %p --eof; ");
+	printf("%s   printf(): ", prefix);
+	ret = printf(sfmt, NULL, 0, 0);
+	printf("ret=%i\n", ret);
+	fflush(stdout);
+	ft_printf("%sft_printf(): ", prefix);
+	ret = ft_printf(sfmt, NULL, 0, 0);
+	ft_printf("ret=%i\n", ret);
+}
+
 static void test99()
 {
 	char	prefix[128];
@@ -103,11 +120,11 @@ static void test99()
 
 	strcpy(prefix, "test99: ");
 	strcpy(sfmt, "%%c: %c; %%s: %s; %%p: %p; %%d: %d; %%i: %i; %%u: %u; %%x: %x; %%X: %X --eof; ");
-	printf("%s: ", prefix);
+	printf("%s   printf(): ", prefix);
 	ret = printf(sfmt, 'a', "Lorem ipsum", (void *)prefix, 125, -128, 325u, 0xfa, 0xfb);
 	printf("ret=%i\n", ret);
 	fflush(stdout);
-	ft_printf("%s: ", prefix);
+	ft_printf("%sft_printf(): ", prefix);
 	ret = ft_printf(sfmt,  'a', "Lorem ipsum", (void *)prefix, 125, -128, 325u, 0xfa, 0xfb);
 	ft_printf("ret=%i\n", ret);
 }
@@ -117,6 +134,7 @@ int	main(void)
 	test01();
 	test02();
 	test03();
+	test04();
 	test99();
 	return (0);
 }