diff --git a/reactos/include/ndk/rtltypes.h b/reactos/include/ndk/rtltypes.h
index b89927fde99..d7c2768d692 100644
--- a/reactos/include/ndk/rtltypes.h
+++ b/reactos/include/ndk/rtltypes.h
@@ -83,6 +83,8 @@ typedef VOID
 typedef unsigned short RTL_ATOM;
 typedef unsigned short *PRTL_ATOM;
 
+typedef ACL_REVISION_INFORMATION *PACL_REVISION_INFORMATION;
+typedef ACL_SIZE_INFORMATION *PACL_SIZE_INFORMATION;
 typedef struct _ACE
 {
     ACE_HEADER Header;
diff --git a/reactos/include/ndk/umtypes.h b/reactos/include/ndk/umtypes.h
index 7ddaa202c58..df77b0345fa 100644
--- a/reactos/include/ndk/umtypes.h
+++ b/reactos/include/ndk/umtypes.h
@@ -553,7 +553,7 @@ typedef enum _THREADINFOCLASS
 /* Basic Types that aren't defined in User-Mode Headers */
 typedef CONST int CINT;
 typedef CONST char *PCSZ;
-typedef CONST short CSHORT;
+typedef short CSHORT;
 typedef CSHORT *PCSHORT;
 typedef LARGE_INTEGER PHYSICAL_ADDRESS, *PPHYSICAL_ADDRESS;