diff --git a/src/stdlib/intconv.c b/src/stdlib/intconv.c
index bcef9ef..6a4ab44 100644
--- a/src/stdlib/intconv.c
+++ b/src/stdlib/intconv.c
@@ -45,6 +45,7 @@ static void _ft_stdlib_llconv(ft_test *t)
 	ft_log(t, "\nSimple unsigned decimal:\n");
 	assert_conv("73", 73ull);
 	assert_conv("0", 0ull);
+	assert_conv("-0", 0ull);
 	assert_conv("  1729", 1729ull);
 	assert_conv("18446744073709551615", 18446744073709551615ull);
 	ft_assert_eval(t, func("0x10000000000000001", NULL, 0),
@@ -52,11 +53,13 @@ static void _ft_stdlib_llconv(ft_test *t)
 
 	ft_log(t, "\nOverflow situations:\n");
 	assert_errno("18446744073709551616", ERANGE);
+	assert_errno("0", 0);
 	assert_errno("-0", 0);
 	assert_errno("-1", ERANGE);
 	assert_errno("-73", ERANGE);
 	assert_errno("-18446744073709551616", ERANGE);
 	assert_errno("0xffffffffffffffff", 0);
+	assert_errno("0x10000000000000000", ERANGE);
 	assert_errno("0x10000000000000001", ERANGE);
 
 	ft_log(t, "\nBase detection:\n");