diff --git a/printf.c b/printf.c
index 7f4ee74..5623742 100644
--- a/printf.c
+++ b/printf.c
@@ -67,9 +67,15 @@ int fmt(char c, va_list args)
 		case 'd':
 			return (_puts(_itoa(va_arg(args, int), 10)));
 		case 'i':
-			return (_puts(_itoa(va_arg(args, int), 10)));
+			return (_puts(_itoa(va_arg(args, unsigned int), 10)));
+		case 'u':
+			return (_puts(_uitoa(va_arg(args, unsigned int), 10)));
 		case 'b':
-			return (_puts(_itoa(va_arg(args, int), 2)));
+			return (_puts(_uitoa(va_arg(args, unsigned int), 2)));
+		case 'o':
+			return (_puts(_uitoa(va_arg(args, unsigned int), 8)));
+		case 'x':
+			return (_puts(_uitoa(va_arg(args, unsigned int), 16)));
 		default:
 			_putchar('%'); /* TODO make this cleaner */
 			_putchar(c);