diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index d1138a501e1..b652727f9ce 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -1,8 +1,5 @@
 #ifndef _WINNT_H
 #define _WINNT_H
-#if __GNUC__ >= 3
-#pragma GCC system_header
-#endif
 
 #ifdef __GNUC__
 #include <msvctarget.h>
@@ -41,10 +38,6 @@ extern "C" {
 #include <basetsd.h>
 #include <guiddef.h>
 
-#ifndef __cplusplus
-    typedef unsigned short wchar_t;
-#endif
-
 #include <ctype.h>
 #undef __need_wchar_t
 
diff --git a/reactos/include/reactos/wine/winnt.h b/reactos/include/reactos/wine/winnt.h
index a2efb693b1d..385ab59b7dd 100644
--- a/reactos/include/reactos/wine/winnt.h
+++ b/reactos/include/reactos/wine/winnt.h
@@ -33,8 +33,6 @@
 #define LANG_ESPERANTO                   0x8f
 #define LANG_WALON                       0x90
 #define LANG_CORNISH                     0x91
-#define LANG_WELSH                       0x92
-#define LANG_BRETON                      0x93
 
 /* FIXME: these are not in the Windows header */
 #define LANG_GAELIC         0x94