diff --git a/dll/win32/shcore/main.c b/dll/win32/shcore/main.c
index 79e8949b295..58c285a59c8 100644
--- a/dll/win32/shcore/main.c
+++ b/dll/win32/shcore/main.c
@@ -2464,7 +2464,11 @@ BOOL WINAPI IsOS(DWORD feature)
     case OS_MEORGREATER:
         ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS && minorv >= 90);
     case OS_XPORGREATER:
+#ifdef __REACTOS__
+        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && ((majorv >= 5 && minorv >= 1) || majorv >= 6));
+#else
         ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5 && minorv >= 1);
+#endif /* __REACTOS__ */
     case OS_HOME:
         ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5 && minorv >= 1);
     case OS_PROFESSIONAL: