diff --git a/include/types.h b/include/types.h
index c38a738..a1622fe 100644
--- a/include/types.h
+++ b/include/types.h
@@ -4,7 +4,9 @@
 typedef unsigned char	u8;
 typedef unsigned short	u16;
 typedef unsigned int	u32;
-typedef unsigned char uchar;
+typedef char	s8;
+typedef short	s16;
+typedef int	s32;
 typedef int bool; 
 
 struct dtr {