diff --git a/reactos/include/ntos/types.h b/reactos/include/ntos/types.h
index 999a271051b..3efeef39e20 100644
--- a/reactos/include/ntos/types.h
+++ b/reactos/include/ntos/types.h
@@ -26,7 +26,7 @@
 typedef signed char         INT8, *PINT8;
 typedef signed short        INT16, *PINT16;
 
-typedef unsigned short      UINT8, *PUINT8;
+typedef unsigned char       UINT8, *PUINT8;
 typedef unsigned short      UINT16, *PUINT16;