diff --git a/sdk/include/psdk/winnls.h b/sdk/include/psdk/winnls.h
index 15e291cf12b..b0e4c35460e 100644
--- a/sdk/include/psdk/winnls.h
+++ b/sdk/include/psdk/winnls.h
@@ -22,6 +22,7 @@ extern "C" {
 #define LOCALE_RETURN_NUMBER	0x20000000
 #endif
 #define LOCALE_RETURN_GENITIVE_NAMES  0x10000000
+#define LOCALE_ALLOW_NEUTRAL_NAMES    0x08000000
 #define LOCALE_ILANGUAGE	1
 #define LOCALE_SLANGUAGE	2
 #define LOCALE_SENGLANGUAGE	0x1001