diff --git a/reactos/dll/win32/kernel32/winnls/locale_rc.rc b/reactos/dll/win32/kernel32/winnls/locale_rc.rc
index 14fffbe3d5a..2c1ceca0825 100644
--- a/reactos/dll/win32/kernel32/winnls/locale_rc.rc
+++ b/reactos/dll/win32/kernel32/winnls/locale_rc.rc
@@ -381,7 +381,7 @@
 
 //#include "nls/wal.nls"   /* 0x0490  LANG_WALON, SUBLANG_DEFAULT */
 
-//#include "nls/cor.nls"   /* 0x0491  LANG_CORNISH, SUBLANG_DEFAULT */
+//#include "nls/cor.nls"   /* 0x0492  LANG_CORNISH, SUBLANG_DEFAULT */
 
 //#include "nls/gae.nls"   /* 0x0494  LANG_GAELIC, SUBLANG_GAELIC */
 //#include "nls/gdh.nls"   /* 0x0894  LANG_GAELIC, SUBLANG_GAELIC_SCOTTISH */
diff --git a/reactos/include/host/nls.h b/reactos/include/host/nls.h
index 837651a9568..076a4442892 100644
--- a/reactos/include/host/nls.h
+++ b/reactos/include/host/nls.h
@@ -161,7 +161,7 @@ typedef DWORD LCID;
 /* non standard; keep the number high enough (but < 0xff) */
 #define LANG_ESPERANTO			 0x8f
 #define LANG_WALON			 0x90
-#define LANG_CORNISH                     0x91
+#define LANG_CORNISH                     0x92
 #define LANG_GAELIC                      0x94
 
 /* Sublanguage definitions */
diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index d06b573bf6d..81342b51f39 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -1196,7 +1196,7 @@ typedef enum {
 /* FIXME: non-standard */
 #define LANG_ESPERANTO      0x8f
 #define LANG_WALON          0x90
-#define LANG_CORNISH        0x91
+#define LANG_CORNISH        0x92
 
 /* FIXME: not present in the official headers */
 #define LANG_MALAGASY       0x8d