diff --git a/include/winnls.h b/include/winnls.h
index 13274be6e80..58344b478c8 100644
--- a/include/winnls.h
+++ b/include/winnls.h
@@ -835,6 +835,7 @@ WINBASEAPI INT         WINAPI GetGeoInfoW(GEOID,GEOTYPE,LPWSTR,INT,LANGID);
 WINBASEAPI INT         WINAPI GetLocaleInfoA(LCID,LCTYPE,LPSTR,INT);
 WINBASEAPI INT         WINAPI GetLocaleInfoW(LCID,LCTYPE,LPWSTR,INT);
 #define                       GetLocaleInfo WINELIB_NAME_AW(GetLocaleInfo)
+WINBASEAPI INT         WINAPI GetLocaleInfoEx(LPCWSTR,LCTYPE,LPWSTR,INT);
 WINBASEAPI INT         WINAPI GetNumberFormatA(LCID,DWORD,LPCSTR,const NUMBERFMTA*,LPSTR,INT);
 WINBASEAPI INT         WINAPI GetNumberFormatW(LCID,DWORD,LPCWSTR,const NUMBERFMTW*,LPWSTR,INT);
 #define                       GetNumberFormat WINELIB_NAME_AW(GetNumberFormat)