diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index 7d95be6d495..86fcd9e2801 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -2936,7 +2936,8 @@ typedef union _ULARGE_INTEGER {
   ULONGLONG QuadPart;
 } ULARGE_INTEGER, *PULARGE_INTEGER;
 typedef struct _LUID {
-    LARGE_INTEGER_ORDER(LONG)
+    DWORD LowPart;
+    LONG HighPart;
 } LUID, *PLUID;
 #pragma pack(push,4)
 typedef struct _LUID_AND_ATTRIBUTES {
diff --git a/reactos/include/reactos/idl/lsa.idl b/reactos/include/reactos/idl/lsa.idl
index 08b214ab504..e752c8161b6 100644
--- a/reactos/include/reactos/idl/lsa.idl
+++ b/reactos/include/reactos/idl/lsa.idl
@@ -11,7 +11,7 @@ typedef LSAPR_HANDLE *PLSAPR_HANDLE;
 
 cpp_quote("#ifndef _WINNT_H")
 typedef struct _LUID {
-    ULONG LowPart;
+    DWORD LowPart;
     LONG HighPart;
 } LUID, *PLUID;
 cpp_quote("#endif")