diff --git a/ft_isalpha.c b/ft_isalpha.c
index 1d6f940..b94b2c5 100644
--- a/ft_isalpha.c
+++ b/ft_isalpha.c
@@ -2,7 +2,7 @@
 
 int	ft_isalpha(const char c)
 {
-	if ((c > 65 && c < 90) || (c > 97 && c < 122))
+	if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
 		return (1);
 	return (0);
 }