diff --git a/reactos/include/psdk/winnls.h b/reactos/include/psdk/winnls.h
index 4ef122053d6..7a9eb2b13a7 100644
--- a/reactos/include/psdk/winnls.h
+++ b/reactos/include/psdk/winnls.h
@@ -163,6 +163,8 @@ static const WCHAR LOCALE_NAME_SYSTEM_DEFAULT[] = {'!','s','y','s','-','d','e','
 #define NORM_IGNORENONSPACE	2
 #define NORM_IGNORESYMBOLS	4
 #define NORM_IGNOREWIDTH	131072
+#define LINGUISTIC_IGNORECASE 0x00000010
+#define NORM_LINGUISTIC_CASING 0x08000000
 #define SORT_STRINGSORT	4096
 #define LCMAP_LOWERCASE 0x00000100
 #define LCMAP_UPPERCASE 0x00000200